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

content/gpu/gpu_child_thread.cc

 // Copyright (c) 2012 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 "content/gpu/gpu_child_thread.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 221 matching lines @@
 #endif
 
   // Only set once per process instance.
   process_control_.reset(new GpuProcessControlImpl());
 
   // Use of base::Unretained(this) is safe here because |service_registry()|
   // will be destroyed before GpuChildThread is destructed.
   service_registry()->AddService(base::Bind(
       &GpuChildThread::BindProcessControlRequest, base::Unretained(this)));
 
-  if (GetContentClient()->gpu())  // NULL in tests.
+  if (GetContentClient()->gpu()) {  // NULL in tests.
+    GetContentClient()->gpu()->Initialize(this);
     GetContentClient()->gpu()->RegisterMojoServices(service_registry());
+  }
+}
+
+void GpuChildThread::OnFieldTrialGroupFinalized(const std::string& trial_name,
+                                                const std::string& group_name) {
+  Send(new GpuHostMsg_FieldTrialActivated(trial_name));
 }
 
 bool GpuChildThread::Send(IPC::Message* msg) {
   // The GPU process must never send a synchronous IPC message to the browser
   // process. This could result in deadlock.
   DCHECK(!msg->is_sync());
 
   return ChildThreadImpl::Send(msg);
 }
 
@@ skipping 306 matching lines @@
 
 void GpuChildThread::BindProcessControlRequest(
     mojo::InterfaceRequest<mojom::ProcessControl> request) {
   DVLOG(1) << "GPU: Binding ProcessControl request";
   DCHECK(process_control_);
   process_control_bindings_.AddBinding(process_control_.get(),
                                        std::move(request));
 }
 
 }  // namespace content