gpu: Implement idle async pixel transfers.

gpu/command_buffer/service/gles2_cmd_decoder.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.
 
 // This file contains the GLES2Decoder class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 
 #include <vector>
@@ skipping 145 matching lines @@
 
   // Gets the QueryManager for this context.
   virtual QueryManager* GetQueryManager() = 0;
 
   // Gets the VertexArrayManager for this context.
   virtual VertexArrayManager* GetVertexArrayManager() = 0;
 
   // Process any pending queries. Returns false if there are no pending queries.
   virtual bool ProcessPendingQueries() = 0;
 
+  // Returns false if there are no pending queries or idle tasks to be made.
+  virtual bool HasMoreWork() = 0;
+
+  // Idle work handler. Returns false if there is no pending idle work.
+  virtual bool PerformIdleWork() = 0;
+
   // Sets a callback which is called when a glResizeCHROMIUM command
   // is processed.
   virtual void SetResizeCallback(
       const base::Callback<void(gfx::Size)>& callback) = 0;
 
   virtual void SetStreamTextureManager(StreamTextureManager* manager) = 0;
 
   // Interface to performing async pixel transfers.
   virtual gfx::AsyncPixelTransferDelegate* GetAsyncPixelTransferDelegate() = 0;
   virtual void SetAsyncPixelTransferDelegate(
@@ skipping 84 matching lines @@
   bool log_commands_;
   bool log_synthesized_gl_errors_;
   static bool testing_force_is_angle_;
 
   DISALLOW_COPY_AND_ASSIGN(GLES2Decoder);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_