Move RTP stats histograms from VieChannel to SendStatisticsProxy.

webrtc/video/send_statistics_proxy.h

 /*
  *  Copyright (c) 2013 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 151 matching lines @@
     BoolSampleCounter key_frame_counter_;
     BoolSampleCounter quality_limited_frame_counter_;
     SampleCounter quality_downscales_counter_;
     BoolSampleCounter bw_limited_frame_counter_;
     SampleCounter bw_resolutions_disabled_counter_;
     SampleCounter delay_counter_;
     SampleCounter max_delay_counter_;
     rtc::RateTracker input_frame_rate_tracker_;
     rtc::RateTracker sent_frame_rate_tracker_;
     int64_t first_rtcp_stats_time_ms_;
+    int64_t first_rtp_stats_time_ms_;
     ReportBlockStats report_block_stats_;
     const VideoSendStream::Stats start_stats_;
   };
 
   rtc::scoped_ptr<UmaSamplesContainer> uma_container_ GUARDED_BY(crit_);
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_VIDEO_SEND_STATISTICS_PROXY_H_