Add MediaStreamSource frame rate calculation to the tracker.

content/browser/resources/media/webrtc_internals.js

Index: content/browser/resources/media/webrtc_internals.js
diff --git a/content/browser/resources/media/webrtc_internals.js b/content/browser/resources/media/webrtc_internals.js
index 3a1f9cd25c19e86fd4e746faf192bc12195ddcb1..c66c3ae20e5ebf5663a9f9e0d3f8b0a24c2c4f10 100644
--- a/content/browser/resources/media/webrtc_internals.js
+++ b/content/browser/resources/media/webrtc_internals.js
@@ -299,6 +299,18 @@ function addGetUserMedia(data) {
 
 
 /**
+ * Handles the report of stats.
+ *
+ * @param {!Object} data The object containing pid, video_id, fps,
+ *     dropped_frames, bla, bla.
+ */
+function addVideoStats(data) {
+  console.log("addvideoStats video source name" + data.video_id + " frame rate" + data.input_frame_rate + " dropped frames " + data.number_of_dropped_frames);
+    // TODO
+}
+
+
+/**
  * Removes the getUserMedia requests from the specified |rid|.
  *
  * @param {!Object} data The object containing rid {number}, the render id.