Field trial synchronization to PPAPI process.

content/browser/ppapi_plugin_process_host.cc

Index: content/browser/ppapi_plugin_process_host.cc
diff --git a/content/browser/ppapi_plugin_process_host.cc b/content/browser/ppapi_plugin_process_host.cc
index 4c7b64120193dc95620eeb9a484252b37f6f2813..2180801709650803996a5e82c670e6f2e4aed5b9 100644
--- a/content/browser/ppapi_plugin_process_host.cc
+++ b/content/browser/ppapi_plugin_process_host.cc
@@ -402,7 +402,7 @@ bool PpapiPluginProcessHost::Init(const PepperPluginInfo& info) {
     cmd_line->CopySwitchesFrom(browser_command_line, kPluginForwardSwitches,
                                arraysize(kPluginForwardSwitches));
 
-    // Copy any flash args over and introduce field trials if necessary.
+    // Copy any flash args over if necessary.
     // TODO(vtl): Stop passing flash args in the command line, or windows is
     // going to explode.
     std::string existing_args =
@@ -479,6 +479,8 @@ bool PpapiPluginProcessHost::OnMessageReceived(const IPC::Message& msg) {
   IPC_BEGIN_MESSAGE_MAP(PpapiPluginProcessHost, msg)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_ChannelCreated,
                         OnRendererPluginChannelCreated)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_FieldTrialActivated,
+                        OnFieldTrialActivated);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   DCHECK(handled);
@@ -498,6 +500,14 @@ void PpapiPluginProcessHost::OnChannelConnected(int32_t peer_pid) {
   pending_requests_.clear();
 }
 
+void PpapiPluginProcessHost::OnFieldTrialActivated(
+    const std::string& trial_name) {
+  // Activate the trial in the browser process to match its state in the
+  // PPAPI process. This is done by calling FindFullName which finalizes the
+  // group and activates the trial.
+  base::FieldTrialList::FindFullName(trial_name);
+}
+
 // Called when the browser <--> plugin channel has an error. This normally
 // means the plugin has crashed.
 void PpapiPluginProcessHost::OnChannelError() {