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

chrome/renderer/chrome_render_thread_observer.cc

Index: chrome/renderer/chrome_render_thread_observer.cc
diff --git a/chrome/renderer/chrome_render_thread_observer.cc b/chrome/renderer/chrome_render_thread_observer.cc
index d23eb4b46d87921a1cae784405d041ed70e5a4ca..d662feb8f2dcfd421d1a9ba5b706af133a4d875b 100644
--- a/chrome/renderer/chrome_render_thread_observer.cc
+++ b/chrome/renderer/chrome_render_thread_observer.cc
@@ -236,7 +236,7 @@ void CreateResourceUsageReporter(
 bool ChromeRenderThreadObserver::is_incognito_process_ = false;
 
 ChromeRenderThreadObserver::ChromeRenderThreadObserver()
-    : field_trial_syncer_(content::RenderThread::Get()), weak_factory_(this) {
+    : field_trial_syncer_(this), weak_factory_(this) {
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
@@ -284,6 +284,13 @@ bool ChromeRenderThreadObserver::OnControlMessageReceived(
   return handled;
 }
 
+void ChromeRenderThreadObserver::OnFieldTrialGroupFinalized(
+    const std::string& trial_name,
+    const std::string& group_name) {
+  content::RenderThread::Get()->Send(
+      new ChromeViewHostMsg_FieldTrialActivated(trial_name));
+}
+
 void ChromeRenderThreadObserver::OnSetIsIncognitoProcess(
     bool is_incognito_process) {
   is_incognito_process_ = is_incognito_process;