android: Eliminate use of IsZeroSize method

webrtc/common_video/video_frame.cc

 /*
  *  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 27 matching lines @@
 
 VideoFrame::VideoFrame(const rtc::scoped_refptr<VideoFrameBuffer>& buffer,
                        uint32_t timestamp,
                        int64_t render_time_ms,
                        VideoRotation rotation)
     : video_frame_buffer_(buffer),
       timestamp_(timestamp),
       ntp_time_ms_(0),
       render_time_ms_(render_time_ms),
       rotation_(rotation) {
+  RTC_DCHECK(buffer);
 }
 
 void VideoFrame::CreateEmptyFrame(int width,
                                   int height,
                                   int stride_y,
                                   int stride_u,
                                   int stride_v) {
   const int half_width = (width + 1) / 2;
   RTC_DCHECK_GT(width, 0);
   RTC_DCHECK_GT(height, 0);
@@ skipping 108 matching lines @@
   return !video_frame_buffer_;
 }
 
 const rtc::scoped_refptr<VideoFrameBuffer>& VideoFrame::video_frame_buffer()
     const {
   return video_frame_buffer_;
 }
 
 void VideoFrame::set_video_frame_buffer(
     const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer) {
+  RTC_DCHECK(buffer);
   video_frame_buffer_ = buffer;
 }
 
 VideoFrame VideoFrame::ConvertNativeToI420Frame() const {
   RTC_DCHECK(video_frame_buffer_->native_handle());
   VideoFrame frame;
   frame.ShallowCopy(*this);
   frame.set_video_frame_buffer(video_frame_buffer_->NativeToI420Buffer());
   return frame;
 }
@@ skipping 10 matching lines @@
     case kVideoCodecULPFEC:
     case kVideoCodecGeneric:
     case kVideoCodecUnknown:
       return 0;
   }
   RTC_NOTREACHED();
   return 0;
 }
 
 }  // namespace webrtc