Field trial synchronization to PPAPI process.

content/ppapi_plugin/ppapi_thread.cc

Index: content/ppapi_plugin/ppapi_thread.cc
diff --git a/content/ppapi_plugin/ppapi_thread.cc b/content/ppapi_plugin/ppapi_thread.cc
index 5829f837086061c51d729fed63072f4311e472b5..c1b9eb126c10dbed4a840df25b10a8c774aee85d 100644
--- a/content/ppapi_plugin/ppapi_thread.cc
+++ b/content/ppapi_plugin/ppapi_thread.cc
@@ -111,7 +111,8 @@ PpapiThread::PpapiThread(const base::CommandLine& command_line, bool is_broker)
       plugin_globals_(GetIOTaskRunner()),
       connect_instance_func_(NULL),
       local_pp_module_(base::RandInt(0, std::numeric_limits<PP_Module>::max())),
-      next_plugin_dispatcher_id_(1) {
+      next_plugin_dispatcher_id_(1),
+      field_trial_syncer_(this) {
   plugin_globals_.SetPluginProxyDelegate(this);
   plugin_globals_.set_command_line(
       command_line.GetSwitchValueASCII(switches::kPpapiFlashArgs));
@@ -133,6 +134,7 @@ PpapiThread::PpapiThread(const base::CommandLine& command_line, bool is_broker)
     base::DiscardableMemoryAllocator::SetInstance(
         ChildThreadImpl::discardable_shared_memory_manager());
   }
+  field_trial_syncer_.InitFieldTrialObserving(command_line);
 }
 
 PpapiThread::~PpapiThread() {
@@ -483,6 +485,12 @@ void PpapiThread::OnHang() {
     base::PlatformThread::Sleep(base::TimeDelta::FromSeconds(1));
 }
 
+void PpapiThread::OnFieldTrialGroupFinalized(const std::string& trial_name,
+                                             const std::string& group_name) {
+  // IPC to the browser process to tell it the specified trial was activated.
+  Send(new PpapiHostMsg_FieldTrialActivated(trial_name));
+}
+
 bool PpapiThread::SetupChannel(base::ProcessId renderer_pid,
                                int renderer_child_id,
                                bool incognito,