Make field trials activated in the GPU process be reflected in browser.

chrome/gpu/chrome_content_gpu_client.cc

 // Copyright 2016 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.
 
 #include "chrome/gpu/chrome_content_gpu_client.h"
 
+#include "base/command_line.h"
 #include "content/public/common/service_registry.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/gpu/gpu_arc_video_service.h"
 #endif
 
 #if defined(OS_CHROMEOS)
 namespace {
 
 void CreateGpuArcVideoService(
@@ skipping 12 matching lines @@
 ChromeContentGpuClient::ChromeContentGpuClient() {}
 
 ChromeContentGpuClient::~ChromeContentGpuClient() {}
 
 void ChromeContentGpuClient::RegisterMojoServices(
     content::ServiceRegistry* registry) {
 #if defined(OS_CHROMEOS)
   registry->AddService(base::Bind(&CreateGpuArcVideoService));
 #endif
 }
+
+void ChromeContentGpuClient::Initialize(
+    base::FieldTrialList::Observer* observer) {
+  DCHECK(!field_trial_syncer_);
+  field_trial_syncer_.reset(
+      new chrome_variations::ChildProcessFieldTrialSyncer(observer));
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
+  field_trial_syncer_->InitFieldTrialObserving(command_line);
+}