Make ChromeTrackEvent visible with TRACE_EVENT macro

Bug: b/171790119
Change-Id: I00249eab13ecee8163c52f90a91bcaeaa8899a2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507651Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Andrew Shulaev <ddrone@google.com>
Cr-Commit-Position: refs/heads/master@{#828192}

base/BUILD.gn

@@ -2196,6 +2196,7 @@ component("base") {
 
     deps += [
       "//base/tracing/protos:chrome_track_event",
+      "//base/tracing/protos:chrome_track_event_zero",
       "//third_party/perfetto/include/perfetto/protozero",
     ]
 

base/trace_event/typed_macros.h

@@ -12,8 +12,8 @@
 
 // Needed not for this file, but for every user of the TRACE_EVENT macros for
 // the lambda definition. So included here for convenience.
+#include "base/tracing/protos/chrome_track_event.pbzero.h"
 #include "third_party/perfetto/include/perfetto/tracing/event_context.h"
-#include "third_party/perfetto/protos/perfetto/trace/track_event/track_event.pbzero.h"
 
 #if defined(TRACE_EVENT_BEGIN)
 #error "Another copy of perfetto tracing macros have been included"

base/tracing/protos/BUILD.gn

@@ -20,6 +20,8 @@ protozero_library("chrome_track_event_zero") {
   perfetto_root_path = "//third_party/perfetto/"
   sources = [ "chrome_track_event.proto" ]
   import_dirs = [ "//third_party/perfetto/" ]
+  generator_plugin_options = "wrapper_namespace=pbzero"
+  omit_protozero_dep = true
 }
 
 grit("chrome_track_event_resources") {

base/tracing/protos/chrome_track_event.proto

@@ -4,7 +4,7 @@
 
 syntax = "proto2";
 
-import "protos/perfetto/trace/track_event/track_event.proto";
+import public "protos/perfetto/trace/track_event/track_event.proto";
 
 package perfetto.protos;