Step #4: Run VideoProcessor integration test batch mode on task queue.

webrtc/modules/video_coding/codecs/test/videoprocessor.h

Index: webrtc/modules/video_coding/codecs/test/videoprocessor.h
diff --git a/webrtc/modules/video_coding/codecs/test/videoprocessor.h b/webrtc/modules/video_coding/codecs/test/videoprocessor.h
index 242844387a77b6eada4d42d9ca5838acd0b5e483..93482c4f476ae6cf6144f5ce47d80b76848b01b6 100644
--- a/webrtc/modules/video_coding/codecs/test/videoprocessor.h
+++ b/webrtc/modules/video_coding/codecs/test/videoprocessor.h
@@ -132,12 +132,14 @@ struct TestConfig {
 // purposes.
 class VideoProcessor {
  public:
-  virtual ~VideoProcessor() {}
+  virtual ~VideoProcessor() = default;
 
   // Performs initial calculations about frame size, sets up callbacks etc.
   // Returns false if an error has occurred, in addition to printing to stderr.
   virtual bool Init() = 0;
 
+  virtual void DeregisterCallbacks() = 0;
+
   // Processes a single frame. Returns true as long as there's more frames
   // available in the source clip.
   // Frame number must be an integer >= 0.
@@ -172,8 +174,9 @@ class VideoProcessorImpl : public VideoProcessor {
                      FrameWriter* source_frame_writer,
                      IvfFileWriter* encoded_frame_writer,
                      FrameWriter* decoded_frame_writer);
-  virtual ~VideoProcessorImpl();
+  ~VideoProcessorImpl() override;
   bool Init() override;
+  void DeregisterCallbacks() override;
   bool ProcessFrame(int frame_number) override;
 
  private: