Reland: Introduce GpuVideoDecodeAcceleratorFactory.

content/common/gpu/media/fake_video_decode_accelerator.h

 // Copyright 2014 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_MEDIA_FAKE_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_FAKE_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <stdint.h>
 
 #include <queue>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
+#include "content/common/gpu/media/gpu_video_decode_accelerator_helpers.h"
 #include "media/video/video_decode_accelerator.h"
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/gl/gl_context.h"
 
 namespace content {
 
 class CONTENT_EXPORT FakeVideoDecodeAccelerator
     : public media::VideoDecodeAccelerator {
  public:
   FakeVideoDecodeAccelerator(
-      gfx::GLContext* gl,
-      gfx::Size size,
-      const base::Callback<bool(void)>& make_context_current);
+      const gfx::Size& size,
+      const MakeGLContextCurrentCallback& make_context_current_cb);
   ~FakeVideoDecodeAccelerator() override;
 
   bool Initialize(const Config& config, Client* client) override;
   void Decode(const media::BitstreamBuffer& bitstream_buffer) override;
   void AssignPictureBuffers(
       const std::vector<media::PictureBuffer>& buffers) override;
   void ReusePictureBuffer(int32_t picture_buffer_id) override;
   void Flush() override;
   void Reset() override;
   void Destroy() override;
-  bool CanDecodeOnIOThread() override;
+  bool TryToSetupDecodeOnSeparateThread(
+      const base::WeakPtr<Client>& decode_client,
+      const scoped_refptr<base::SingleThreadTaskRunner>& decode_task_runner)
+      override;
 
  private:
   void DoPictureReady();
 
   // The message loop that created the class. Used for all callbacks. This
   // class expects all calls to this class to be on this message loop (not
   // checked).
   const scoped_refptr<base::SingleThreadTaskRunner> child_task_runner_;
 
   Client* client_;
 
   // Make our context current before running any GL entry points.
-  base::Callback<bool(void)> make_context_current_;
-  gfx::GLContext* gl_;
+  MakeGLContextCurrentCallback make_context_current_cb_;
 
   // Output picture size.
   gfx::Size frame_buffer_size_;
 
   // Picture buffer ids that are available for putting fake frames in.
   std::queue<int> free_output_buffers_;
   // BitstreamBuffer ids for buffers that contain new data to decode.
   std::queue<int> queued_bitstream_ids_;
 
   bool flushing_;
 
   // The WeakPtrFactory for |weak_this_|.
   base::WeakPtrFactory<FakeVideoDecodeAccelerator> weak_this_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeVideoDecodeAccelerator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_FAKE_VIDEO_DECODE_ACCELERATOR_H_