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

chrome/gpu/chrome_content_gpu_client.cc

Index: chrome/gpu/chrome_content_gpu_client.cc
diff --git a/chrome/gpu/chrome_content_gpu_client.cc b/chrome/gpu/chrome_content_gpu_client.cc
index 43bd8fa36a90321b887b9316054784c4a5f0600e..9b007750747d7dd721d48c5201a6638c0d34c3d2 100644
--- a/chrome/gpu/chrome_content_gpu_client.cc
+++ b/chrome/gpu/chrome_content_gpu_client.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/gpu/chrome_content_gpu_client.h"
 
+#include "base/command_line.h"
 #include "content/public/common/service_registry.h"
 
 #if defined(OS_CHROMEOS)
@@ -36,3 +37,13 @@ void ChromeContentGpuClient::RegisterMojoServices(
   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);
+}