Allow to symbolize multiple addresses at once.

Bug: 138725313
Change-Id: I9012332d345b7062669e06bd30a2a366031d94f7
diff --git a/tools/trace_to_text/local_symbolizer.cc b/tools/trace_to_text/local_symbolizer.cc
index 9b30bb3..dde9ea0 100644
--- a/tools/trace_to_text/local_symbolizer.cc
+++ b/tools/trace_to_text/local_symbolizer.cc
@@ -321,16 +321,19 @@
   }
   return result;
 }
-
-std::vector<SymbolizedFrame> LocalSymbolizer::Symbolize(
+std::vector<std::vector<SymbolizedFrame>> LocalSymbolizer::Symbolize(
     const std::string& mapping_name,
     const std::string& build_id,
-    uint64_t address) {
+    const std::vector<uint64_t>& addresses) {
   base::Optional<std::string> binary =
       finder_.FindBinary(mapping_name, build_id);
   if (!binary)
     return {};
-  return llvm_symbolizer_.Symbolize(*binary, address);
+  std::vector<std::vector<SymbolizedFrame>> result;
+  result.reserve(addresses.size());
+  for (uint64_t address : addresses)
+    result.emplace_back(llvm_symbolizer_.Symbolize(*binary, address));
+  return result;
 }
 
 LocalSymbolizer::~LocalSymbolizer() = default;