ppapi: Send sync point whenever the pepper texture changes.

content/renderer/pepper/pepper_platform_context_3d.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 13 matching lines @@
 
 class PlatformContext3D {
  public:
   explicit PlatformContext3D();
   ~PlatformContext3D();
 
   // Initialize the context.
   bool Init(const int32* attrib_list, PlatformContext3D* share_context);
 
   // Retrieves the mailbox name for the front buffer backing the context.
-  void GetBackingMailbox(gpu::Mailbox* mailbox);
+  void GetBackingMailbox(gpu::Mailbox* mailbox, uint32* sync_point);
+
+  // Inserts a new sync point to associate with the backing mailbox, that should
+  // be waited on before using the mailbox.
+  void InsertSyncPointForBackingMailbox();
 
   // Returns true if the backing texture is always opaque.
   bool IsOpaque();
 
   // This call will return the address of the command buffer for this context
   // that is constructed in Initialize() and is valid until this context is
   // destroyed.
   gpu::CommandBuffer* GetCommandBuffer();
 
   // Returns the GpuControl class that services out-of-band messages.
@@ skipping 16 matching lines @@
   // Run the callback once the channel has been flushed.
   void Echo(const base::Closure& task);
 
  private:
   bool InitRaw();
   void OnContextLost();
   void OnConsoleMessage(const std::string& msg, int id);
 
   scoped_refptr<GpuChannelHost> channel_;
   gpu::Mailbox mailbox_;
+  uint32 sync_point_;
   bool has_alpha_;
   CommandBufferProxyImpl* command_buffer_;
   base::Closure context_lost_callback_;
   ConsoleMessageCallback console_message_callback_;
   base::WeakPtrFactory<PlatformContext3D> weak_ptr_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_H_