Add support for EXT_image_flush_external extension

gpu/ipc/service/stream_texture_android.h

 // Copyright (c) 2013 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 GPU_IPC_SERVICE_STREAM_TEXTURE_ANDROID_H_
 #define GPU_IPC_SERVICE_STREAM_TEXTURE_ANDROID_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 63 matching lines @@
   void OnFrameAvailable();
 
   // IPC::Listener implementation:
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // IPC message handlers:
   void OnStartListening();
   void OnEstablishPeer(int32_t primary_id, int32_t secondary_id);
   void OnSetSize(const gfx::Size& size) { size_ = size; }
 
+  void Flush() override {}
+
   scoped_refptr<gl::SurfaceTexture> surface_texture_;
 
   // Current transform matrix of the surface texture.
   float current_matrix_[16];
 
   // Current size of the surface texture.
   gfx::Size size_;
 
   // Whether a new frame is available that we should update to.
   bool has_pending_frame_;
@@ skipping 10 matching lines @@
   unsigned vertex_buffer_;
   int u_xform_location_;
 
   base::WeakPtrFactory<StreamTexture> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(StreamTexture);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_SERVICE_STREAM_TEXTURE_ANDROID_H_