Revert of [Mojo Video Capture] Adapt video_capture service to refactored video capture stack

media/capture/video/shared_memory_buffer_tracker.h

 // Copyright 2016 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 MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_TRACKER_H_
 #define MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_TRACKER_H_
 
-#include "media/capture/video/shared_memory_buffer_handle.h"
 #include "media/capture/video/video_capture_buffer_tracker.h"
 
 namespace media {
 
+class SharedMemoryBufferHandle;
+
 // Tracker specifics for SharedMemory.
 class SharedMemoryBufferTracker final : public VideoCaptureBufferTracker {
  public:
   SharedMemoryBufferTracker();
 
   bool Init(const gfx::Size& dimensions,
             VideoPixelFormat format,
             VideoPixelStorage storage_type,
             base::Lock* lock) override;
 
   std::unique_ptr<VideoCaptureBufferHandle> GetMemoryMappedAccess() override;
   mojo::ScopedSharedBufferHandle GetHandleForTransit() override;
   base::SharedMemoryHandle GetNonOwnedSharedMemoryHandleForLegacyIPC() override;
 
  private:
   friend class SharedMemoryBufferHandle;
 
   // The memory created to be shared with renderer processes.
   base::SharedMemory shared_memory_;
   size_t mapped_size_;
 };
 
+// A simple proxy that implements the BufferHandle interface, providing
+// accessors to SharedMemTracker's memory and properties.
+class SharedMemoryBufferHandle : public VideoCaptureBufferHandle {
+ public:
+  // |tracker| must outlive SimpleBufferHandle. This is ensured since a
+  // tracker is pinned until ownership of this SimpleBufferHandle is returned
+  // to VideoCaptureBufferPool.
+  explicit SharedMemoryBufferHandle(SharedMemoryBufferTracker* tracker);
+  ~SharedMemoryBufferHandle() override;
+
+  size_t mapped_size() const override;
+  uint8_t* data() override;
+  const uint8_t* data() const override;
+
+ private:
+  SharedMemoryBufferTracker* const tracker_;
+};
+
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_TRACKER_H_