Break tight coupling of VideoCaptureDeviceClient to renderer_host

content/browser/renderer_host/media/video_capture_device_client.h

Index: content/browser/renderer_host/media/video_capture_device_client.h
diff --git a/content/browser/renderer_host/media/video_capture_device_client.h b/content/browser/renderer_host/media/video_capture_device_client.h
index c5447ca18e74eed9969270fb657a72e2aefd87f6..d80f5d2fce2f67053ed0f39ccaec080050d2723b 100644
--- a/content/browser/renderer_host/media/video_capture_device_client.h
+++ b/content/browser/renderer_host/media/video_capture_device_client.h
@@ -17,19 +17,23 @@
 #include "media/capture/video/video_capture_device.h"
 
 namespace content {
-class VideoCaptureBufferPool;
-class VideoCaptureController;
-class VideoCaptureGpuJpegDecoder;
-
-// Receives events from the VideoCaptureDevice and posts them to a |controller_|
-// on the IO thread. An instance of this class may safely outlive its target
-// VideoCaptureController. This is a shallow class meant to convert incoming
-// frames and holds no significant state.
+class ProducerVideoCaptureBufferPool;
+class VideoFrameReceiver;
+class VideoCaptureJpegDecoder;
+
+using VideoCaptureJpegDecoderFactoryCB =
+    base::Callback<std::unique_ptr<VideoCaptureJpegDecoder>()>;
+
+// Implementation of media::VideoCaptureDevice::Client that uses a buffer pool
+// to provide buffers and converts incoming data to the I420 format for
+// consumption by a given VideoFrameReceiver.
 //
 // Methods of this class may be called from any thread, and in practice will
 // often be called on some auxiliary thread depending on the platform and the
 // device type; including, for example, the DirectShow thread on Windows, the
 // v4l2_thread on Linux, and the UI thread for tab capture.
+// The owner is responsible for making sure that the instance outlives these
+// calls.
 //
 // It has an internal ref counted TextureWrapHelper class used to wrap incoming
 // GpuMemoryBuffers into Texture backed VideoFrames. This class creates and
@@ -40,8 +44,9 @@ class CONTENT_EXPORT VideoCaptureDeviceClient
       public base::SupportsWeakPtr<VideoCaptureDeviceClient> {
  public:
   VideoCaptureDeviceClient(
-      const base::WeakPtr<VideoCaptureController>& controller,
-      const scoped_refptr<VideoCaptureBufferPool>& buffer_pool);
+      std::unique_ptr<VideoFrameReceiver> receiver,
+      const scoped_refptr<ProducerVideoCaptureBufferPool>& buffer_pool,
+      const VideoCaptureJpegDecoderFactoryCB& jpeg_decoder_factory);
   ~VideoCaptureDeviceClient() override;
 
   // VideoCaptureDevice::Client implementation.
@@ -91,17 +96,17 @@ class CONTENT_EXPORT VideoCaptureDeviceClient
       uint8_t** u_plane_data,
       uint8_t** v_plane_data);
 
-  // The controller to which we post events.
-  const base::WeakPtr<VideoCaptureController> controller_;
+  // The receiver to which we post events.
+  const std::unique_ptr<VideoFrameReceiver> receiver_;
 
-  // Hardware JPEG decoder.
-  std::unique_ptr<VideoCaptureGpuJpegDecoder> external_jpeg_decoder_;
+  const VideoCaptureJpegDecoderFactoryCB jpeg_decoder_factory_callback_;
+  std::unique_ptr<VideoCaptureJpegDecoder> external_jpeg_decoder_;
 
   // Whether |external_jpeg_decoder_| has been initialized.
   bool external_jpeg_decoder_initialized_;
 
   // The pool of shared-memory buffers used for capturing.
-  const scoped_refptr<VideoCaptureBufferPool> buffer_pool_;
+  const scoped_refptr<ProducerVideoCaptureBufferPool> buffer_pool_;
 
 #if DCHECK_IS_ON()
   // Counter used to track the number of times consecutive capture buffers are