[tp] Make chrome ActiveProcesses a part of track event

This is necessary to unblock aosp/2267925.

We need to get rid of AddParsingOverrideForField for active_processes.pid, but there's no other way to parse track event extensions at the moment. So this field needs to move from extensions to "core" track event proto.

Bug: 255295843
Change-Id: I2457dd01115088c3815ec4c91d6e98ae993acb93
diff --git a/BUILD b/BUILD
index d81c6ee..0b6a285 100644
--- a/BUILD
+++ b/BUILD
@@ -3889,6 +3889,7 @@
 perfetto_proto_library(
     name = "protos_perfetto_trace_track_event_protos",
     srcs = [
+        "protos/perfetto/trace/track_event/chrome_active_processes.proto",
         "protos/perfetto/trace/track_event/chrome_application_state_info.proto",
         "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto",
         "protos/perfetto/trace/track_event/chrome_content_settings_event_info.proto",