Step #2: Add batch mode to VideoProcessor integration tests.

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 90e29905a7f2b0ce016f2124f59514c622536c2d..b4d866ec9941804c5e84ca26ef1d203af7d3d81f 100644
--- a/webrtc/modules/video_coding/codecs/test/videoprocessor.h
+++ b/webrtc/modules/video_coding/codecs/test/videoprocessor.h
@@ -148,10 +148,10 @@ class VideoProcessor {
 
   // Return the size of the encoded frame in bytes. Dropped frames by the
   // encoder are regarded as zero size.
-  virtual size_t EncodedFrameSize() = 0;
+  virtual size_t EncodedFrameSize(int frame_number) = 0;
 
   // Return the encoded frame type (key or delta).
-  virtual FrameType EncodedFrameType() = 0;
+  virtual FrameType EncodedFrameType(int frame_number) = 0;
 
   // Return the number of dropped frames.
   virtual int NumberDroppedFrames() = 0;
@@ -264,10 +264,10 @@ class VideoProcessorImpl : public VideoProcessor {
   void SetRates(int bit_rate, int frame_rate) override;
 
   // Return the size of the encoded frame in bytes.
-  size_t EncodedFrameSize() override;
+  size_t EncodedFrameSize(int frame_number) override;
 
   // Return the encoded frame type (key or delta).
-  FrameType EncodedFrameType() override;
+  FrameType EncodedFrameType(int frame_number) override;
 
   // Return the number of dropped frames.
   int NumberDroppedFrames() override;