Implements peer connection stats measurements in WebRTC call test.

tools/perf/page_sets/third_party/webrtc/samples/js/demos/html/pc1.html

Index: tools/perf/page_sets/third_party/webrtc/samples/js/demos/html/pc1.html
diff --git a/tools/perf/page_sets/third_party/webrtc/samples/js/demos/html/pc1.html b/tools/perf/page_sets/third_party/webrtc/samples/js/demos/html/pc1.html
index f2cf4d03354b63b999a8365bd46826ef4c81e4f7..e00c78865636d7933a084f5e201f4a2f1eef57a1 100644
--- a/tools/perf/page_sets/third_party/webrtc/samples/js/demos/html/pc1.html
+++ b/tools/perf/page_sets/third_party/webrtc/samples/js/demos/html/pc1.html
@@ -41,8 +41,8 @@ btn3.disabled = true;
 var pc1,pc2;
 var localstream;
 var sdpConstraints = {'mandatory': {
-                        'OfferToReceiveAudio':true, 
-                        'OfferToReceiveVideo':true }};
+                      'OfferToReceiveAudio':true,
+                      'OfferToReceiveVideo':true }};
 
 function gotStream(stream){
   trace("Received local stream");
@@ -58,8 +58,8 @@ function start() {
   // Call into getUserMedia via the polyfill (adapter.js).
   getUserMedia({audio:true, video:true},
                 gotStream, function() {});
-}  
-  
+}
+
 function call() {
   btn2.disabled = true;
   btn3.disabled = false;
@@ -67,21 +67,21 @@ function call() {
   videoTracks = localstream.getVideoTracks();
   audioTracks = localstream.getAudioTracks();
   if (videoTracks.length > 0)
-    trace('Using Video device: ' + videoTracks[0].label);  
+    trace('Using Video device: ' + videoTracks[0].label);
   if (audioTracks.length > 0)
     trace('Using Audio device: ' + audioTracks[0].label);
   var servers = null;
   pc1 = new RTCPeerConnection(servers);
   trace("Created local peer connection object pc1");
-  pc1.onicecandidate = iceCallback1; 
+  pc1.onicecandidate = iceCallback1;
   pc2 = new RTCPeerConnection(servers);
   trace("Created remote peer connection object pc2");
   pc2.onicecandidate = iceCallback2;
-  pc2.onaddstream = gotRemoteStream; 
+  pc2.onaddstream = gotRemoteStream;
 
   pc1.addStream(localstream);
   trace("Adding Local Stream to peer connection");
-  
+
   pc1.createOffer(gotDescription1, onCreateSessionDescriptionError);
 }
 
@@ -108,7 +108,7 @@ function gotDescription2(desc){
 
 function hangup() {
   trace("Ending call");
-  pc1.close(); 
+  pc1.close();
   pc2.close();
   pc1 = null;
   pc2 = null;
@@ -129,7 +129,7 @@ function iceCallback1(event){
     trace("Local ICE candidate: \n" + event.candidate.candidate);
   }
 }
-      
+
 function iceCallback2(event){
   if (event.candidate) {
     pc1.addIceCandidate(new RTCIceCandidate(event.candidate),