FakeVideoCaptureDevice: add support for capturing into Dma-Bufs using VGEM in CrOs

media/video/capture/fake_video_capture_device.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.
 
 // Implementation of a fake VideoCaptureDevice class. Used for testing other
 // video capture classes when no real hardware is available.
 
 #ifndef MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_
 #define MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_
 
@@ skipping 39 matching lines @@
   base::ThreadChecker thread_checker_;
 
   const FakeVideoCaptureDeviceType device_type_;
 
   scoped_ptr<VideoCaptureDevice::Client> client_;
   // |fake_frame_| is used for capturing on Own Buffers.
   scoped_ptr<uint8[]> fake_frame_;
   int frame_count_;
   VideoCaptureFormat capture_format_;
 
+#if defined(OS_CHROMEOS) && defined(USE_OZONE)
+  // |client_->ReserveOutputBuffer()| might give a Buffer with null data(), in
+  // that case and for certain platforms, we can try and map the underlying
+  // Buffer::AsPlatformFile(), which is a dma-buf. This can only happen via the
+  // VGEM API. VgemWrapper encapsulates all the operations regarding it.
+  class VgemWrapper;
+  scoped_ptr<VgemWrapper> vgem_wrapper_;
+#endif
+
   // FakeVideoCaptureDevice post tasks to itself for frame construction and
   // needs to deal with asynchronous StopAndDeallocate().
   base::WeakPtrFactory<FakeVideoCaptureDevice> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeVideoCaptureDevice);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_