Added command buffer implementation of WebGL which runs in the sandbox....

chrome/browser/renderer_host/browser_render_process_host.cc

Index: chrome/browser/renderer_host/browser_render_process_host.cc
===================================================================
--- chrome/browser/renderer_host/browser_render_process_host.cc	(revision 42776)
+++ chrome/browser/renderer_host/browser_render_process_host.cc	(working copy)
@@ -773,7 +773,9 @@
       IPC_MESSAGE_HANDLER(ViewHostMsg_ExtensionCloseChannel,
                           OnExtensionCloseChannel)
       IPC_MESSAGE_HANDLER(ViewHostMsg_EstablishGpuChannel,
-          OnMsgEstablishGpuChannel)
+                          OnMsgEstablishGpuChannel)
+      IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_SynchronizeGpu,
+                                      OnMsgSynchronizeGpu)
       IPC_MESSAGE_HANDLER(ViewHostMsg_SpellChecker_RequestDictionary,
                           OnSpellCheckerRequestDictionary)
       IPC_MESSAGE_UNHANDLED_ERROR()
@@ -982,6 +984,10 @@
   GpuProcessHost::Get()->EstablishGpuChannel(id());
 }
 
+void BrowserRenderProcessHost::OnMsgSynchronizeGpu(IPC::Message* reply) {
+  GpuProcessHost::Get()->Synchronize(id(), reply);
+}
+
 void BrowserRenderProcessHost::OnSpellCheckerRequestDictionary() {
   if (profile()->GetSpellCheckHost()) {
     // The spellchecker initialization already started and finished; just send