Execute all GL commands up to the put offset reported by a flush.

content/common/gpu/gpu_channel.h

Index: content/common/gpu/gpu_channel.h
===================================================================
--- content/common/gpu/gpu_channel.h	(revision 92876)
+++ content/common/gpu/gpu_channel.h	(working copy)
@@ -6,6 +6,7 @@
 #define CONTENT_COMMON_GPU_GPU_CHANNEL_H_
 #pragma once
 
+#include <queue>
 #include <set>
 #include <string>
 #include <vector>
@@ -78,6 +79,15 @@
   // IPC::Message::Sender implementation:
   virtual bool Send(IPC::Message* msg);
 
+  // Whether this channel is able to handle IPC messages.
+  bool IsScheduled();
+
+  // This is called when a command buffer transitions from the unscheduled
+  // state to the scheduled state, which potentially means the channel
+  // transitions from the unscheduled to the scheduled state. When this occurs
+  // deferred IPC messaged are handled.
+  void OnScheduled();
+
   void CreateViewCommandBuffer(
       gfx::PluginWindowHandle window,
       int32 render_view_id,
@@ -131,6 +141,8 @@
 
   bool OnControlMessageReceived(const IPC::Message& msg);
 
+  void HandleDeferredMessages();
+
   int GenerateRouteID();
 
   // Message handlers.
@@ -138,11 +150,11 @@
   void OnCreateOffscreenCommandBuffer(
       const gfx::Size& size,
       const GPUCreateCommandBufferConfig& init_params,
-      int32* route_id);
-  void OnDestroyCommandBuffer(int32 route_id);
+      IPC::Message* reply_message);
+  void OnDestroyCommandBuffer(int32 route_id, IPC::Message* reply_message);
 
   void OnCreateOffscreenSurface(const gfx::Size& size,
-                                int* route_id);
+                                IPC::Message* reply_message);
   void OnDestroySurface(int route_id);
 
   void OnCreateTransportTexture(int32 context_route_id, int32 host_id);
@@ -154,6 +166,8 @@
 
   scoped_ptr<IPC::SyncChannel> channel_;
 
+  std::queue<IPC::Message*> deferred_messages_;
+
   // The id of the renderer who is on the other side of the channel.
   int renderer_id_;
 
@@ -188,6 +202,8 @@
   gpu::gles2::DisallowedExtensions disallowed_extensions_;
   GpuWatchdog* watchdog_;
 
+  ScopedRunnableMethodFactory<GpuChannel> task_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuChannel);
 };