Add custom field option annotations to json output

Custom options are required to put config directly into the metric proto
without requiring an extra config file. These options are now included
to json output of metrics, under a special __annotations field.

To add custom options, we need to included
google/protobuf/descriptor.proto, which does not use LITE_RUNTIME.
Consequently, none of our metric protos can use LITE_RUNTIME anymore.
This CL removes LITE_RUNTIME from all metric related files.

See an example metric + output here:
https://gist.github.com/deepanjanroy/ce78bdca3ac9dae2eece43db8b76e2b1

Change-Id: I689f0f2f5ab6a8cfbb37f36c015383c1272f094b
diff --git a/BUILD b/BUILD
index 0cc3c33..bb3a96b 100644
--- a/BUILD
+++ b/BUILD
@@ -709,6 +709,7 @@
 filegroup(
     name = "src_trace_processor_metrics_lib",
     srcs = [
+        "src/trace_processor/metrics/custom_options.descriptor.h",
         "src/trace_processor/metrics/metrics.cc",
         "src/trace_processor/metrics/metrics.descriptor.h",
         "src/trace_processor/metrics/metrics.h",
diff --git a/protos/perfetto/metrics/custom_options.proto b/protos/perfetto/metrics/custom_options.proto
new file mode 100644
index 0000000..8f4bfbb
--- /dev/null
+++ b/protos/perfetto/metrics/custom_options.proto
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+syntax = "proto2";
+
+import "google/protobuf/descriptor.proto";
+
+// Field options you can define on a metric. These options are only exposed as
+// part of JSON export.
+extend google.protobuf.FieldOptions {
+  optional string unit = 50001;
+  optional string improvementDirection = 50002;
+}
diff --git a/src/perfetto_cmd/perfetto_config.descriptor.h b/src/perfetto_cmd/perfetto_config.descriptor.h
index c630e83..f9e012e 100644
--- a/src/perfetto_cmd/perfetto_config.descriptor.h
+++ b/src/perfetto_cmd/perfetto_config.descriptor.h
@@ -25,7 +25,7 @@
 // This file was autogenerated by tools/gen_binary_descriptors. Do not edit.
 
 // SHA1(tools/gen_binary_descriptors)
-// f242f1ac484bbe7ba4c45e77b56ab588f8015196
+// d6628b15181dba5287e35b56b966b39ea93d42b1
 // SHA1(protos/perfetto/config/perfetto_config.proto)
 // 9bf7f741997f67724c7ee1b186b117708ac5228d
 
diff --git a/src/protozero/test/example_proto/test_messages.descriptor.h b/src/protozero/test/example_proto/test_messages.descriptor.h
index 849203b..f27e4ec 100644
--- a/src/protozero/test/example_proto/test_messages.descriptor.h
+++ b/src/protozero/test/example_proto/test_messages.descriptor.h
@@ -25,7 +25,7 @@
 // This file was autogenerated by tools/gen_binary_descriptors. Do not edit.
 
 // SHA1(tools/gen_binary_descriptors)
-// f242f1ac484bbe7ba4c45e77b56ab588f8015196
+// d6628b15181dba5287e35b56b966b39ea93d42b1
 // SHA1(src/protozero/test/example_proto/test_messages.proto)
 // bd59c7719b091c8277d2dce867d28dfa5b40bab2
 
diff --git a/src/trace_processor/importers/proto/chrome_compositor_scheduler_state.descriptor.h b/src/trace_processor/importers/proto/chrome_compositor_scheduler_state.descriptor.h
index a088e87..adc3f2d 100644
--- a/src/trace_processor/importers/proto/chrome_compositor_scheduler_state.descriptor.h
+++ b/src/trace_processor/importers/proto/chrome_compositor_scheduler_state.descriptor.h
@@ -25,7 +25,7 @@
 // This file was autogenerated by tools/gen_binary_descriptors. Do not edit.
 
 // SHA1(tools/gen_binary_descriptors)
-// f242f1ac484bbe7ba4c45e77b56ab588f8015196
+// d6628b15181dba5287e35b56b966b39ea93d42b1
 // SHA1(protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto)
 // b7dab60e553ebda32178373fa290f99afb94e55a
 
diff --git a/src/trace_processor/importers/proto/track_event.descriptor.h b/src/trace_processor/importers/proto/track_event.descriptor.h
index 998a400..e0237e6 100644
--- a/src/trace_processor/importers/proto/track_event.descriptor.h
+++ b/src/trace_processor/importers/proto/track_event.descriptor.h
@@ -25,7 +25,7 @@
 // This file was autogenerated by tools/gen_binary_descriptors. Do not edit.
 
 // SHA1(tools/gen_binary_descriptors)
-// f242f1ac484bbe7ba4c45e77b56ab588f8015196
+// d6628b15181dba5287e35b56b966b39ea93d42b1
 // SHA1(protos/perfetto/trace/track_event/track_event.proto)
 // 1cd2627d7a57ddcf4e61b967cd255011bf3a09d5
 
diff --git a/src/trace_processor/metrics/BUILD.gn b/src/trace_processor/metrics/BUILD.gn
index 0d2db64..bc35137 100644
--- a/src/trace_processor/metrics/BUILD.gn
+++ b/src/trace_processor/metrics/BUILD.gn
@@ -65,6 +65,7 @@
 if (enable_perfetto_trace_processor_sqlite) {
   source_set("lib") {
     sources = [
+      "custom_options.descriptor.h",
       "metrics.cc",
       "metrics.descriptor.h",
       "metrics.h",
diff --git a/src/trace_processor/metrics/custom_options.descriptor.h b/src/trace_processor/metrics/custom_options.descriptor.h
new file mode 100644
index 0000000..3829d74
--- /dev/null
+++ b/src/trace_processor/metrics/custom_options.descriptor.h
@@ -0,0 +1,692 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SRC_TRACE_PROCESSOR_METRICS_CUSTOM_OPTIONS_DESCRIPTOR_H_
+#define SRC_TRACE_PROCESSOR_METRICS_CUSTOM_OPTIONS_DESCRIPTOR_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <array>
+
+// This file was autogenerated by tools/gen_binary_descriptors. Do not edit.
+
+// SHA1(tools/gen_binary_descriptors)
+// d6628b15181dba5287e35b56b966b39ea93d42b1
+// SHA1(protos/perfetto/metrics/custom_options.proto)
+// 074c971d85f72345988fb3279345cd6b3dabde9c
+
+// This is the proto CustomOptions encoded as a ProtoFileDescriptor to allow
+// for reflection without libprotobuf full/non-lite protos.
+
+namespace perfetto {
+
+constexpr std::array<uint8_t, 7803> kCustomOptionsDescriptor{
+    {0x0a, 0x9b, 0x3b, 0x0a, 0x20, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f,
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+     0x18, 0xd1, 0x86, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x75, 0x6e,
+     0x69, 0x74, 0x3a, 0x53, 0x0a, 0x14, 0x69, 0x6d, 0x70, 0x72, 0x6f, 0x76,
+     0x65, 0x6d, 0x65, 0x6e, 0x74, 0x44, 0x69, 0x72, 0x65, 0x63, 0x74, 0x69,
+     0x6f, 0x6e, 0x12, 0x1d, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e,
+     0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x46, 0x69, 0x65,
+     0x6c, 0x64, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x18, 0xd2, 0x86,
+     0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x14, 0x69, 0x6d, 0x70, 0x72, 0x6f,
+     0x76, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x44, 0x69, 0x72, 0x65, 0x63, 0x74,
+     0x69, 0x6f, 0x6e}};
+
+}  // namespace perfetto
+
+#endif  // SRC_TRACE_PROCESSOR_METRICS_CUSTOM_OPTIONS_DESCRIPTOR_H_
diff --git a/src/trace_processor/metrics/metrics.descriptor.h b/src/trace_processor/metrics/metrics.descriptor.h
index ad5b9b3..3624a88 100644
--- a/src/trace_processor/metrics/metrics.descriptor.h
+++ b/src/trace_processor/metrics/metrics.descriptor.h
@@ -25,7 +25,7 @@
 // This file was autogenerated by tools/gen_binary_descriptors. Do not edit.
 
 // SHA1(tools/gen_binary_descriptors)
-// f242f1ac484bbe7ba4c45e77b56ab588f8015196
+// d6628b15181dba5287e35b56b966b39ea93d42b1
 // SHA1(protos/perfetto/metrics/metrics.proto)
 // e42eba6105b571de21762d07d9034b56d68faa06
 
diff --git a/src/trace_processor/proto_to_json.cc b/src/trace_processor/proto_to_json.cc
index 5b07889..e6f22e9 100644
--- a/src/trace_processor/proto_to_json.cc
+++ b/src/trace_processor/proto_to_json.cc
@@ -14,9 +14,14 @@
  * limitations under the License.
  */
 
+#include <vector>
+
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/message.h>
 
 #include "perfetto/base/logging.h"
+#include "perfetto/ext/base/string_utils.h"
 #include "src/trace_processor/proto_to_json.h"
 
 namespace perfetto {
@@ -160,14 +165,162 @@
   return ret;
 }
 
+// This is a class helps avoid the situation where every function has to take
+// field_options_prototype as an argument, which becomes distracting.
+class OptionsConverter {
+ public:
+  explicit OptionsConverter(
+      const google::protobuf::Message* field_options_prototype)
+      : field_options_prototype_(field_options_prototype) {}
+
+  // Prints all field options for non-empty fields of a message. Example:
+  // --- Message definitions ---
+  // FooMessage {
+  //   repeated int64 foo = 1 [op1 = val1, op2 = val2];
+  //   optional BarMessage bar = 2 [op3 = val3];
+  // }
+  //
+  // BarMessage {
+  //   optional int64 baz = 1 [op4 = val4];
+  // }
+  // --- MessageInstance ---
+  // foo_msg = {  // (As JSON)
+  //   foo: [23, 24, 25],
+  //   bar: {
+  //     baz: 42
+  //   }
+  // }
+  // --- Output of MessageFieldOptionsToJson(foo_msg) ---
+  //   foo: {
+  //     __field_options: {
+  //       op1: val1,
+  //       op2: val2,
+  //     },
+  //     __repeated: true
+  //   }
+  //   bar: {
+  //     __field_options: {
+  //       op3 = val3,
+  //     },
+  //     baz: {
+  //       __field_options: {
+  //         op4 = val4
+  //       },
+  //     }
+  //   }
+  // --- Notes ---
+  // This function does not produce the surrounding braces for easier use in
+  // recursive use cases. The caller needs to surround the output with braces.
+  std::string MessageFieldOptionsToJson(
+      const google::protobuf::Message& message,
+      uint32_t indent) {
+    using google::protobuf::FieldDescriptor;
+    std::vector<const FieldDescriptor*> field_descs;
+    message.GetReflection()->ListFields(message, &field_descs);
+    std::vector<std::string> field_outputs;
+    for (auto* field_desc : field_descs) {
+      std::vector<std::string> field_entries;
+      if (HasFieldOptions(field_desc)) {
+        std::string options_entry;
+        options_entry +=
+            std::string(indent + 2, ' ') + R"("__field_options": )";
+        options_entry += FieldOptionsToJson(field_desc, indent + 4);
+        field_entries.push_back(std::move(options_entry));
+      }
+      std::string nested_fields =
+          NestedMessageFieldOptionsToJson(message, field_desc, indent + 2);
+      if (nested_fields != "") {
+        field_entries.push_back(std::move(nested_fields));
+      }
+      // We don't output annotations for a field if that field and all its
+      // descendants have no field options.
+      if (field_entries.size() > 0) {
+        if (field_desc->is_repeated()) {
+          field_entries.push_back(std::string(indent, ' ') +
+                                  R"("__repeated": true)");
+        }
+        std::string field_output;
+        const std::string& name = field_desc->is_extension()
+                                      ? field_desc->full_name()
+                                      : field_desc->name();
+        field_output += std::string(indent, ' ') + "\"" + name + "\": {\n";
+        field_output += base::Join(field_entries, ",\n") + "\n";
+        field_output += std::string(indent, ' ') + "}";
+        field_outputs.push_back(std::move(field_output));
+      }
+    }
+    return base::Join(field_outputs, ",\n");
+  }
+
+ private:
+  static bool HasFieldOptions(
+      const google::protobuf::FieldDescriptor* field_desc) {
+    return field_desc->options().ByteSizeLong() > 0;
+  }
+
+  std::string NestedMessageFieldOptionsToJson(
+      const google::protobuf::Message& message,
+      const google::protobuf::FieldDescriptor* field_desc,
+      uint32_t indent) {
+    using google::protobuf::FieldDescriptor;
+    if (field_desc->cpp_type() != FieldDescriptor::CppType::CPPTYPE_MESSAGE)
+      return "";
+    const auto* reflection = message.GetReflection();
+    const google::protobuf::Message& nested_message =
+        field_desc->is_repeated()
+            ? reflection->GetRepeatedMessage(message, field_desc, 0)
+            : reflection->GetMessage(message, field_desc);
+    return MessageFieldOptionsToJson(nested_message, indent);
+  }
+
+  std::string FieldOptionsToJson(
+      const google::protobuf::FieldDescriptor* field_desc,
+      uint32_t indent) {
+    PERFETTO_DCHECK(HasFieldOptions(field_desc));
+    std::unique_ptr<google::protobuf::Message> options(
+        field_options_prototype_->New());
+    // Field option extensions are compiled at runtime as opposed to being
+    // compiled in and being part of the generated pool, so the field option
+    // must be re-parsed as a dynamic message for the extensions to show up. If
+    // we do not do this, the extension fields remain "unknown fields" to the
+    // reflection API.
+    options->ParseFromString(field_desc->options().SerializeAsString());
+    return MessageToJson(*options, indent);
+  }
+
+  const google::protobuf::Message* field_options_prototype_;
+};
+
 }  // namespace
 
 std::string MessageToJson(const google::protobuf::Message& message,
                           uint32_t indent) {
-  return "{" + MessageFieldsToJson(message, indent + 2) + "\n" +
+  return "{" + MessageFieldsToJson(message, indent + 2) + '\n' +
          std::string(indent, ' ') + "}";
 }
 
+std::string MessageToJsonWithAnnotations(
+    const google::protobuf::Message& message,
+    const google::protobuf::Message* field_options_prototype,
+    uint32_t indent) {
+  std::string ret;
+  OptionsConverter options_converter(field_options_prototype);
+
+  ret = "{" + MessageFieldsToJson(message, indent + 2);
+  std::string annotation_fields =
+      options_converter.MessageFieldOptionsToJson(message, indent + 4);
+  if (annotation_fields != "") {
+    ret += ",\n";
+    ret += std::string(indent + 2, ' ') + "\"__annotations\": {\n";
+    ret += annotation_fields + "\n";
+    ret += std::string(indent + 2, ' ') + "}\n";
+  } else {
+    ret += "\n";
+  }
+  ret += std::string(indent, ' ') + "}\n";
+  return ret;
+}
+
 }  // namespace proto_to_json
 }  // namespace trace_processor
 }  // namespace perfetto
diff --git a/src/trace_processor/proto_to_json.h b/src/trace_processor/proto_to_json.h
index f46f4c1..90cae5c 100644
--- a/src/trace_processor/proto_to_json.h
+++ b/src/trace_processor/proto_to_json.h
@@ -26,6 +26,11 @@
 std::string MessageToJson(const google::protobuf::Message& message,
                           uint32_t indent = 0);
 
+std::string MessageToJsonWithAnnotations(
+    const google::protobuf::Message& message,
+    const google::protobuf::Message* field_options_prototype,
+    uint32_t indent = 0);
+
 }  // namespace proto_to_json
 }  // namespace trace_processor
 }  // namespace perfetto
diff --git a/src/trace_processor/trace_processor_shell.cc b/src/trace_processor/trace_processor_shell.cc
index 5b8cf62..594e13e 100644
--- a/src/trace_processor/trace_processor_shell.cc
+++ b/src/trace_processor/trace_processor_shell.cc
@@ -36,6 +36,7 @@
 #include "perfetto/ext/base/string_splitter.h"
 #include "perfetto/trace_processor/read_trace.h"
 #include "perfetto/trace_processor/trace_processor.h"
+#include "src/trace_processor/metrics/custom_options.descriptor.h"
 #include "src/trace_processor/metrics/metrics.descriptor.h"
 #include "src/trace_processor/proto_to_json.h"
 
@@ -322,12 +323,12 @@
   ErrorPrinter printer;
   google::protobuf::io::Tokenizer tokenizer(&stream, &printer);
 
-  auto* proto = desc_set.add_file();
+  auto* file_desc = desc_set.add_file();
   google::protobuf::compiler::Parser parser;
-  parser.Parse(&tokenizer, proto);
+  parser.Parse(&tokenizer, file_desc);
 
-  proto->set_name(BaseName(extend_metrics_proto));
-  pool->BuildFile(*proto);
+  file_desc->set_name(BaseName(extend_metrics_proto));
+  pool->BuildFile(*file_desc);
 
   std::vector<uint8_t> metric_proto;
   metric_proto.resize(static_cast<size_t>(desc_set.ByteSize()));
@@ -376,7 +377,13 @@
       break;
     }
     case OutputFormat::kJson: {
-      auto out = proto_to_json::MessageToJson(*metrics) + "\n";
+      // We need to instantiate field options from dynamic message factory
+      // because otherwise it cannot parse our custom extensions.
+      const google::protobuf::Message* field_options_prototype =
+          factory.GetPrototype(
+              pool.FindMessageTypeByName("google.protobuf.FieldOptions"));
+      auto out = proto_to_json::MessageToJsonWithAnnotations(
+          *metrics, field_options_prototype, 0);
       fwrite(out.c_str(), sizeof(char), out.size(), stdout);
       break;
     }
@@ -917,6 +924,16 @@
 
 #endif  // PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
 
+void ExtendPoolWithBinaryDescriptor(google::protobuf::DescriptorPool& pool,
+                                    const void* data,
+                                    int size) {
+  google::protobuf::FileDescriptorSet desc_set;
+  desc_set.ParseFromArray(data, size);
+  for (const auto& desc : desc_set.file()) {
+    pool.BuildFile(desc);
+  }
+}
+
 int TraceProcessorMain(int argc, char** argv) {
   CommandLineOptions options = ParseCommandLineOptions(argc, argv);
 
@@ -992,13 +1009,14 @@
   auto t_run_start = base::GetWallTimeNs();
 
   // Descriptor pool used for printing output as textproto.
-  google::protobuf::DescriptorPool pool;
-  google::protobuf::FileDescriptorSet root_desc_set;
-  root_desc_set.ParseFromArray(kMetricsDescriptor.data(),
-                               kMetricsDescriptor.size());
-  for (const auto& desc : root_desc_set.file()) {
-    pool.BuildFile(desc);
-  }
+  // Building on top of generated pool so default protos in
+  // google.protobuf.descriptor.proto are available.
+  google::protobuf::DescriptorPool pool(
+      google::protobuf::DescriptorPool::generated_pool());
+  ExtendPoolWithBinaryDescriptor(pool, kMetricsDescriptor.data(),
+                                 kMetricsDescriptor.size());
+  ExtendPoolWithBinaryDescriptor(pool, kCustomOptionsDescriptor.data(),
+                                 kCustomOptionsDescriptor.size());
 
   if (!options.metric_extra.empty()) {
     util::Status status = RegisterExtraMetrics(options.metric_extra, "");
diff --git a/tools/gen_binary_descriptors b/tools/gen_binary_descriptors
index 439d596..839d7c0 100755
--- a/tools/gen_binary_descriptors
+++ b/tools/gen_binary_descriptors
@@ -37,6 +37,8 @@
         'src/protozero/test/example_proto/test_messages.descriptor.h',
     'protos/perfetto/trace/track_event/track_event.proto':
         'src/trace_processor/importers/proto/track_event.descriptor.h',
+    'protos/perfetto/metrics/custom_options.proto':
+        'src/trace_processor/metrics/custom_options.descriptor.h',
 }
 
 ROOT_DIR = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
@@ -83,6 +85,8 @@
         protoc_path,
         '--include_imports',
         '--proto_path=.',
+        '--proto_path=' + \
+            os.path.join(ROOT_DIR, "buildtools", "protobuf", "src"),
         '--descriptor_set_out={}'.format(fdescriptor.name),
         source,
     ],