Revert of [Mojo Video Capture] Simplify media::VideoCaptureDevice::Client:Buffer to a struct

media/capture/video/shared_memory_buffer_tracker.h

Index: media/capture/video/shared_memory_buffer_tracker.h
diff --git a/media/capture/video/shared_memory_buffer_tracker.h b/media/capture/video/shared_memory_buffer_tracker.h
index 3c6a3579df1d16dd3c8625612cd2121d986a64a1..1b6ceb9a6a65e286663bac142d0af9c77e2a7189 100644
--- a/media/capture/video/shared_memory_buffer_tracker.h
+++ b/media/capture/video/shared_memory_buffer_tracker.h
@@ -21,7 +21,7 @@
             VideoPixelStorage storage_type,
             base::Lock* lock) override;
 
-  std::unique_ptr<VideoCaptureBufferHandle> GetMemoryMappedAccess() override;
+  std::unique_ptr<VideoCaptureBufferHandle> GetBufferHandle() override;
   mojo::ScopedSharedBufferHandle GetHandleForTransit() override;
 
  private:
@@ -42,9 +42,14 @@
   explicit SharedMemoryBufferHandle(SharedMemoryBufferTracker* tracker);
   ~SharedMemoryBufferHandle() override;
 
+  gfx::Size dimensions() const override;
   size_t mapped_size() const override;
-  uint8_t* data() override;
-  const uint8_t* data() 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<VideoFrame> GetVideoFrame() override;
 
  private:
   SharedMemoryBufferTracker* const tracker_;