Move RTCP histograms from vie_channel to video channel stats proxies.

webrtc/common_types.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 193 matching lines @@
     nack_requests += other.nack_requests;
     unique_nack_requests += other.unique_nack_requests;
     if (other.first_packet_time_ms != -1 &&
        (other.first_packet_time_ms < first_packet_time_ms ||
         first_packet_time_ms == -1)) {
       // Use oldest time.
       first_packet_time_ms = other.first_packet_time_ms;
     }
   }
 
+  RtcpPacketTypeCounter Subtract(const RtcpPacketTypeCounter& other) const {
+    RtcpPacketTypeCounter diff = other;
+    diff.nack_packets -= nack_packets;
+    diff.fir_packets -= fir_packets;
+    diff.pli_packets -= pli_packets;
+    diff.nack_requests -= nack_requests;
+    diff.unique_nack_requests -= unique_nack_requests;
+    if (diff.first_packet_time_ms != -1 &&
+        diff.first_packet_time_ms < first_packet_time_ms) {
+      // Use youngest time.
+      diff.first_packet_time_ms = first_packet_time_ms;
+    }
+    return diff;
+  }
+
   int64_t TimeSinceFirstPacketInMs(int64_t now_ms) const {
     return (first_packet_time_ms == -1) ? -1 : (now_ms - first_packet_time_ms);
   }
 
   int UniqueNackRequestsInPercent() const {
     if (nack_requests == 0) {
       return 0;
     }
     return static_cast<int>(
         (unique_nack_requests * 100.0f / nack_requests) + 0.5f);
@@ skipping 614 matching lines @@
                                    uint32_t ssrc) = 0;
 };
 
 // RTCP mode to use. Compound mode is described by RFC 4585 and reduced-size
 // RTCP mode is described by RFC 5506.
 enum class RtcpMode { kOff, kCompound, kReducedSize };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_TYPES_H_