Move RTCP histograms from vie_channel to video channel stats proxies.

webrtc/video/send_statistics_proxy_unittest.cc

 /*
  *  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 66 matching lines @@
       EXPECT_EQ(a.rtp_stats.retransmitted.packets,
                 b.rtp_stats.retransmitted.packets);
       EXPECT_EQ(a.rtp_stats.fec.packets, b.rtp_stats.fec.packets);
 
       EXPECT_EQ(a.rtcp_stats.fraction_lost, b.rtcp_stats.fraction_lost);
       EXPECT_EQ(a.rtcp_stats.cumulative_lost, b.rtcp_stats.cumulative_lost);
       EXPECT_EQ(a.rtcp_stats.extended_max_sequence_number,
                 b.rtcp_stats.extended_max_sequence_number);
       EXPECT_EQ(a.rtcp_stats.jitter, b.rtcp_stats.jitter);
     }
   }

[pbos-webrtc, 2016/02/23 15:15:26]

Can you add a test for the -= start_stats_ mechanism?

[sprang, 2016/02/23 16:42:10]

Done.
Also fixed the bug it caught :/

 
+  SimulatedClock fake_clock_;
   rtc::scoped_ptr<SendStatisticsProxy> statistics_proxy_;
-  SimulatedClock fake_clock_;
   VideoSendStream::Config config_;
   int avg_delay_ms_;
   int max_delay_ms_;
   VideoSendStream::Stats expected_;
   typedef std::map<uint32_t, VideoSendStream::StreamStats>::const_iterator
       StreamIterator;
 };
 
 TEST_F(SendStatisticsProxyTest, RtcpStatistics) {
   RtcpStatisticsCallback* callback = statistics_proxy_.get();
@@ skipping 327 matching lines @@
   VideoSendStream::Stats stats = statistics_proxy_->GetStats();
   EXPECT_EQ(static_cast<int>(bitrate.bitrate_bps),
             stats.substreams[config_.rtp.ssrcs[0]].total_bitrate_bps);
   EXPECT_EQ(static_cast<int>(bitrate.bitrate_bps),
             stats.substreams[config_.rtp.ssrcs[0]].retransmit_bitrate_bps);
   EXPECT_EQ(0, stats.substreams[config_.rtp.ssrcs[1]].total_bitrate_bps);
   EXPECT_EQ(0, stats.substreams[config_.rtp.ssrcs[1]].retransmit_bitrate_bps);
 }
 
 }  // namespace webrtc