gpu: Mailbox emulation with EGLImage

android_webview/lib/main/aw_main_delegate.cc

Index: android_webview/lib/main/aw_main_delegate.cc
diff --git a/android_webview/lib/main/aw_main_delegate.cc b/android_webview/lib/main/aw_main_delegate.cc
index 7bf9e7f117fa30cb99da0c70f7dc364d223f7bf3..55a96a613199f5976d3871e62cdeba2cb28e82b3 100644
--- a/android_webview/lib/main/aw_main_delegate.cc
+++ b/android_webview/lib/main/aw_main_delegate.cc
@@ -26,6 +26,7 @@
 #include "content/public/common/content_switches.h"
 #include "gpu/command_buffer/client/gl_in_process_context.h"
 #include "gpu/command_buffer/service/in_process_command_buffer.h"
+#include "gpu/command_buffer/service/mailbox_synchronizer.h"
 #include "media/base/media_switches.h"
 #include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
@@ -67,9 +68,7 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   cl->AppendSwitch(switches::kDisableExperimentalWebGL);
   cl->AppendSwitch(switches::kDisableSharedWorkers);
 
-  // Ganesh backed 2D-Canvas integration is being implemented but not ready to
-  // be turned on by default yet.
-  if (!cl->HasSwitch(switches::kEnableAccelerated2dCanvas))
+  if (!gpu::gles2::MailboxSynchronizer::Initialize())
     cl->AppendSwitch(switches::kDisableAccelerated2dCanvas);
 
   // File system API not supported (requires some new API; internal bug 6930981)