Fixes a memory leak when running webrtc-internals for a long time, by using a circular buffer of si…

content/browser/resources/media/data_series.js

Index: content/browser/resources/media/data_series.js
diff --git a/content/browser/resources/media/data_series.js b/content/browser/resources/media/data_series.js
index f32c822c5539e1084689961e9cde5c54e0c9fd83..3dfad4e28077c1f02bb9cb3b1d4bac27705058c6 100644
--- a/content/browser/resources/media/data_series.js
+++ b/content/browser/resources/media/data_series.js
@@ -6,6 +6,8 @@
  * A TimelineDataSeries collects an ordered series of (time, value) pairs,
  * and converts them to graph points.  It also keeps track of its color and
  * current visibility state.
+ * It keeps MAX_STATS_DATA_POINT_BUFFER_SIZE data points at most. Old data
+ * points will be dropped when it reaches this size.
  */
 var TimelineDataSeries = (function() {
   'use strict';
@@ -35,6 +37,9 @@ var TimelineDataSeries = (function() {
     addPoint: function(timeTicks, value) {
       var time = new Date(timeTicks);
       this.dataPoints_.push(new DataPoint(time, value));
+
+      if (this.dataPoints_.length > MAX_STATS_DATA_POINT_BUFFER_SIZE)
+        this.dataPoints_.shift();
     },
 
     isVisible: function() {