Adds UMA histograms for WebRTC.DataChannelMaxRetransmits WebRTC.DataChannelMaxRetransmitTime.

content/renderer/media/rtc_data_channel_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/rtc_data_channel_handler.h"
 
+#include <limits>
 #include <string>
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/utf_string_conversions.h"
 
 namespace content {
 
 namespace {
 
@@ skipping 21 matching lines @@
   DVLOG(1) << "::ctor";
   channel_->RegisterObserver(this);
 
   IncrementCounter(CHANNEL_CREATED);
   if (isReliable())
     IncrementCounter(CHANNEL_RELIABLE);
   if (ordered())
     IncrementCounter(CHANNEL_ORDERED);
   if (negotiated())
     IncrementCounter(CHANNEL_NEGOTIATED);
+
+  UMA_HISTOGRAM_CUSTOM_COUNTS("WebRTC.DataChannelMaxRetransmits",
+                              maxRetransmits(), 1,

[jiayl, 2014/05/07 16:25:07]

min should be 0

[perkj_chrome, 2014/05/07 17:53:56]

oops - I thought this was the size of each slot in the histogram.

+                              std::numeric_limits<unsigned short>::max(), 50);
+  UMA_HISTOGRAM_CUSTOM_COUNTS("WebRTC.DataChannelMaxRetransmitTime",
+                              maxRetransmitTime(), 1,

[jiayl, 2014/05/07 16:25:07]

min should be 0

[perkj_chrome, 2014/05/07 17:53:56]

Done.

+                              std::numeric_limits<unsigned short>::max(), 50);
 }
 
 RtcDataChannelHandler::~RtcDataChannelHandler() {
   DVLOG(1) << "::dtor";
   channel_->UnregisterObserver();
 }
 
 void RtcDataChannelHandler::setClient(
     blink::WebRTCDataChannelHandlerClient* client) {
   webkit_client_ = client;
@@ skipping 120 matching lines @@
                                 num_bytes,
                                 1, kMaxBucketSize, kNumBuckets);
   } else {
     UMA_HISTOGRAM_CUSTOM_COUNTS("WebRTC.UnreliableDataChannelMessageSize",
                                 num_bytes,
                                 1, kMaxBucketSize, kNumBuckets);
   }
 }
 
 }  // namespace content