Support multiple HW video decoders per context.

content/common/gpu/gpu_command_buffer_stub.h

 // Copyright (c) 2011 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_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 #define CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 #pragma once
 
 #if defined(ENABLE_GPU)
 
@@ skipping 98 matching lines @@
   void OnRegisterTransferBuffer(base::SharedMemoryHandle transfer_buffer,
                                 size_t size,
                                 int32 id_request,
                                 IPC::Message* reply_message);
   void OnDestroyTransferBuffer(int32 id, IPC::Message* reply_message);
   void OnGetTransferBuffer(int32 id, IPC::Message* reply_message);
   void OnResizeOffscreenFrameBuffer(const gfx::Size& size);
 
   void OnCreateVideoDecoder(const std::vector<int32>& configs,
                             IPC::Message* reply_message);
-  void OnDestroyVideoDecoder();
+  void OnDestroyVideoDecoder(int32 decoder_route_id);
 
   void OnSwapBuffers();
   void OnCommandProcessed();
   void OnParseError();
 
 #if defined(OS_MACOSX)
   void OnSetWindowSize(const gfx::Size& size);
   void SwapBuffersCallback();
 #endif  // defined(OS_MACOSX)
 
@@ skipping 26 matching lines @@
   scoped_ptr<gpu::GpuScheduler> scheduler_;
 
   // SetParent may be called before Initialize, in which case we need to keep
   // around the parent stub, so that Initialize can set the parent correctly.
   base::WeakPtr<GpuCommandBufferStub> parent_stub_for_initialization_;
   uint32 parent_texture_for_initialization_;
 
   GpuWatchdog* watchdog_;
   ScopedRunnableMethodFactory<GpuCommandBufferStub> task_factory_;
 
-  // The video decoder associated with this stub, if any.
-  scoped_ptr<GpuVideoDecodeAccelerator> video_decoder_;
+  // Zero or more video decoders owned by this stub, keyed by their
+  // decoder_route_id.
+  IDMap<GpuVideoDecodeAccelerator, IDMapOwnPointer> video_decoders_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCommandBufferStub);
 };
 
 #endif  // defined(ENABLE_GPU)
 
 #endif  // CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_