Make CommandBuffer::Flush asynchronous, and add CommandBuffer::FlushSync with former semantics.

chrome/renderer/webplugin_delegate_pepper.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #define PEPPER_APIS_ENABLED 1
 
 #include "chrome/renderer/webplugin_delegate_pepper.h"
 
 #include <string>
 #include <vector>
@@ skipping 761 matching lines @@
     if (callback) {
       command_buffer_->AsyncFlush(
           context->putOffset,
           method_factory3d_.NewRunnableMethod(
               &WebPluginDelegatePepper::Device3DUpdateState,
               id,
               context,
               callback,
               user_data));
     } else {
-      state = command_buffer_->Flush(context->putOffset);
+      state = command_buffer_->FlushSync(context->putOffset);
       Synchronize3DContext(context, state);
     }
   } else {
     if (callback) {
       command_buffer_->AsyncGetState(
           method_factory3d_.NewRunnableMethod(
               &WebPluginDelegatePepper::Device3DUpdateState,
               id,
               context,
               callback,
@@ skipping 968 matching lines @@
   CGRect bounds;
   bounds.origin.x = dest_rect.x();
   bounds.origin.y = canvas_height - dest_rect.y() - dest_rect.height();
   bounds.size.width = dest_rect.width();
   bounds.size.height = dest_rect.height();
 
   CGContextDrawImage(canvas, bounds, image);
   CGContextRestoreGState(canvas);
 }
 #endif  // defined(OS_MACOSX)