Add optional visualization file writers to VideoProcessor tests.

webrtc/test/testsupport/frame_reader.h

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 28 matching lines @@
   // Closes the input file if open. Essentially makes this class impossible
   // to use anymore. Will also be invoked by the destructor.
   virtual void Close() = 0;
 
   // Frame length in bytes of a single frame image.
   virtual size_t FrameLength() = 0;
   // Total number of frames in the input video source.
   virtual int NumberOfFrames() = 0;
 };
 
-class FrameReaderImpl : public FrameReader {
+class YuvFrameReaderImpl : public FrameReader {
  public:
   // Creates a file handler. The input file is assumed to exist and be readable.
   // Parameters:
   //   input_filename          The file to read from.
   //   width, height           Size of each frame to read.
-  FrameReaderImpl(std::string input_filename, int width, int height);
-  ~FrameReaderImpl() override;
+  YuvFrameReaderImpl(std::string input_filename, int width, int height);
+  ~YuvFrameReaderImpl() override;
   bool Init() override;
   rtc::scoped_refptr<I420Buffer> ReadFrame() override;
   void Close() override;
   size_t FrameLength() override;
   int NumberOfFrames() override;
 
  private:
-  std::string input_filename_;
+  const std::string input_filename_;
   size_t frame_length_in_bytes_;
-  int width_;
-  int height_;
+  const int width_;
+  const int height_;
   int number_of_frames_;
   FILE* input_file_;
 };
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_TESTSUPPORT_FRAME_READER_H_