[Mojo Video Capture] Move SharedMem Tracker/BufferHandle/Factory from content to media

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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_SHARED_MEMORY_BUFFER_HANDLE_H_
-#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_SHARED_MEMORY_BUFFER_HANDLE_H_
+#ifndef MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_TRACKER_H_
+#define MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_TRACKER_H_
 
-#include "media/capture/video/video_capture_buffer_handle.h"
+#include "media/capture/video/video_capture_buffer_tracker.h"
 
-namespace content {
+namespace media {
 
-class SharedMemoryBufferTracker;
+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> GetBufferHandle() override;
+  mojo::ScopedSharedBufferHandle GetHandleForTransit() 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 media::VideoCaptureBufferHandle {
+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;
 
   gfx::Size dimensions() const override;
   size_t mapped_size() const override;
   void* data(int plane) override;
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
   base::FileDescriptor AsPlatformFile() override;
 #endif
   bool IsBackedByVideoFrame() const override;
-  scoped_refptr<media::VideoFrame> GetVideoFrame() override;
+  scoped_refptr<VideoFrame> GetVideoFrame() override;
 
  private:
   SharedMemoryBufferTracker* const tracker_;
 };
 
-}  // namespace content
+}  // namespace media
 
-#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_SHARED_MEMORY_BUFFER_HANDLE_H_
+#endif  // MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_TRACKER_H_