Adds UMA histograms for WebRTC.DataChannelMaxRetransmits WebRTC.DataChannelMaxRetransmitTime.

content/renderer/media/rtc_data_channel_handler.cc

Index: content/renderer/media/rtc_data_channel_handler.cc
diff --git a/content/renderer/media/rtc_data_channel_handler.cc b/content/renderer/media/rtc_data_channel_handler.cc
index 9d2b56cba46d30c4379953d8cd1e5959f27f39a4..6db6c70a8aefabbf035a61597adb37fdd21a5a66 100644
--- a/content/renderer/media/rtc_data_channel_handler.cc
+++ b/content/renderer/media/rtc_data_channel_handler.cc
@@ -4,6 +4,7 @@
 
 #include "content/renderer/media/rtc_data_channel_handler.h"
 
+#include <limits>
 #include <string>
 
 #include "base/logging.h"
@@ -45,6 +46,13 @@ RtcDataChannelHandler::RtcDataChannelHandler(
     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() {