Add screen capture constraints, video tag resize and removed auto video resize

chrome/test/data/webrtc/manual/peerconnection.js

Index: chrome/test/data/webrtc/manual/peerconnection.js
diff --git a/chrome/test/data/webrtc/manual/peerconnection.js b/chrome/test/data/webrtc/manual/peerconnection.js
index 5c27fb4303c6d06d0d179263ce93bcfe7ad4b582..b6dbb20e05ef9edd94f00c2d91507a390f7269ae 100644
--- a/chrome/test/data/webrtc/manual/peerconnection.js
+++ b/chrome/test/data/webrtc/manual/peerconnection.js
@@ -123,9 +123,18 @@ function forceOpusChanged() {
  */
 function updateGetUserMediaConstraints() {
   var constraints = {
-     audio: $('audio').checked,
-     video: $('video').checked
+    audio: $('audio').checked,
+    video: $('video').checked
   };
+  if ($('screencapture').checked) {
+    var constraints = {
+      audio: $('audio').checked,
+      video: {mandatory: {chromeMediaSource: 'screen'}}
+    };
+    if ($('audio').checked == true)
+      debug('Audio for screencapture is not implemented as of M28, please ' +
+            'try to set audio = false prior requesting screencapture');
+  }
   $('getusermedia-constraints').value =
       JSON.stringify(constraints, null, ' ');
 }
@@ -166,6 +175,8 @@ window.onload = function() {
   doNotAutoAddLocalStreamWhenCalled();
   hookupDataChannelCallbacks_();
   hookupDtmfSenderCallback_();
+  displayVideoSize_($('local-view'));
+  displayVideoSize_($('remote-view'));
 };
 
 /**