Tracing v2: wire up stubs generated by the protozero protoc plugin

components/tracing/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//third_party/protobuf/proto_library.gni")
 
 component("tracing") {
   sources = [
     "child/child_memory_dump_manager_delegate_impl.cc",
     "child/child_memory_dump_manager_delegate_impl.h",
@@ skipping 16 matching lines @@
     "core/trace_buffer_writer.h",
     "core/trace_ring_buffer.cc",
     "core/trace_ring_buffer.h",
     "tracing_export.h",
   ]
 
   defines = [ "TRACING_IMPLEMENTATION" ]
 
   deps = [
     "//base",
+    "//ipc",
+  ]
+
+  public_deps = [
     "//components/tracing/proto:protos",
-    "//ipc",
   ]
 
   if (is_nacl) {
     sources -= [ "common/process_metrics_memory_dump_provider.cc" ]
   }
 }
 
 component("startup_tracing") {
   sources = [
     "browser/trace_config_file.cc",
@@ skipping 56 matching lines @@
     "//ipc",
     "//testing/gmock:gmock",
     "//testing/gtest",
   ]
 
   if (!is_android) {
     sources += [ "browser/trace_config_file_unittest.cc" ]
     deps += [ ":startup_tracing" ]
   }
 }