Revert of Delete VideoFrame default constructor, and IsZeroSize method.

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

 /*
  *  Copyright (c) 2012 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 186 matching lines @@
   FrameWriter* frame_writer_;
   PacketManipulator* packet_manipulator_;
   const TestConfig& config_;
   Stats* stats_;
 
   EncodedImageCallback* encode_callback_;
   DecodedImageCallback* decode_callback_;
   // Keep track of the last successful frame, since we need to write that
   // when decoding fails:
   uint8_t* last_successful_frame_buffer_;
+  webrtc::VideoFrame source_frame_;
   // To keep track of if we have excluded the first key frame from packet loss:
   bool first_key_frame_has_been_excluded_;
   // To tell the decoder previous frame have been dropped due to packet loss:
   bool last_frame_missing_;
   // If Init() has executed successfully.
   bool initialized_;
   size_t encoded_frame_size_;
   FrameType encoded_frame_type_;
   int prev_time_stamp_;
   int num_dropped_frames_;
@@ skipping 36 matching lines @@
 
    private:
     VideoProcessorImpl* video_processor_;
   };
 };
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_TEST_VIDEOPROCESSOR_H_