media: Add MediaOzonePlatform support

ui/ozone/media/video_decode_factory_ozone.h

+// Copyright (c) 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 UI_OZONE_MEDIA_VIDEO_DECODE_FACTORY_OZONE_H_
+#define UI_OZONE_MEDIA_VIDEO_DECODE_FACTORY_OZONE_H_
+
+#include "media/types/video_decode_accelerator_impl.h"
+
+namespace media {
+class BitstreamBuffer;
+class PictureBuffer;
+}
+
+namespace ui {
+// Interface to perform different media video decoding implementations.
+class VideoDecodeFactoryOzone
+    : public media::VideoDecodeAcceleratorImpl {

[Ami GONE FROM CHROMIUM, 2014/05/07 22:51:27]

Per another comment earlier in the reviewlog, having a singleton backing VDA is
not going to work except for very specific use-cases (e.g. a TV).  Each <video>
tag will attempt to create an instance of OzoneVDA, which as you have it ATM
will cause them all to trigger the same VDFactoryO and sadness will ensue.

I think you want to make the factory vend newly-minted platform-specific
OzoneVDA impls on demand.

[Ami GONE FROM CHROMIUM, 2014/05/07 22:51:27]

I don't think you need the factory to inherit from VDAI even now (and of course
if you take my suggestion above it definitely doesn't need to).

[vignatti (out of this project), 2014/06/02 19:21:42]

Done.

[vignatti (out of this project), 2014/06/02 19:21:42]

Done.

+ public:
+  VideoDecodeFactoryOzone();
+  virtual ~VideoDecodeFactoryOzone();
+
+  // Returns the instance
+  static VideoDecodeFactoryOzone* GetInstance();
+
+  // Sets the implementation delegate. Ownership is retained by the caller.
+  static void SetInstance(VideoDecodeFactoryOzone* impl);
+
+  // media::VideoDecodeAccelerator implementation.
+  virtual bool Initialize(media::VideoCodecProfile profile,
+                          Client* client);
+  virtual void Decode(const media::BitstreamBuffer& bitstream_buffer);
+  virtual void AssignPictureBuffers(
+      const std::vector<media::PictureBuffer>& buffers);
+  virtual void ReusePictureBuffer(int32 picture_buffer_id);
+  virtual void Flush();
+  virtual void Reset();
+  virtual void Destroy();
+
+ private:
+  static VideoDecodeFactoryOzone* impl_; // not owned
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_MEDIA_VIDEO_DECODE_FACTORY_OZONE_H_