Add test for sending square resolution video on a PeerConnection.

content/test/data/media/webrtc_test_utilities.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // These must match with how the video and canvas tags are declared in html.
 const VIDEO_TAG_WIDTH = 320;
 const VIDEO_TAG_HEIGHT = 240;
 
 // Fake video capture background green is of value 135.
 const COLOR_BACKGROUND_GREEN = 135;
@@ skipping 54 matching lines @@
     var context = canvas.getContext('2d');
     context.drawImage(videoElement, 0, 0, width, height);
     var pixels = context.getImageData(0, 0 , width, height / 3).data;
     // Check that there is an old and a new picture with the same size to
     // compare and use the function |predicate| to detect the video state in
     // that case.
     if (oldPixels.length == pixels.length &&
         predicate(pixels, oldPixels)) {
       console.log('Done looking at video in element ' + videoElementName);
       clearInterval(waitVideo);
-      callback();
+      callback(videoElement.videoWidth, videoElement.videoHeight);
     }
     oldPixels = pixels;
   }, 200);
 }
 
+function waitForVideoWithResolution(element, expected_width, expected_height) {
+  addExpectedEvent();
+  detectVideoPlaying(element,
+      function (width, height) {
+        assertEquals(expected_width, width);
+        assertEquals(expected_height, height);
+        eventOccured();
+      });
+}
+
 function waitForVideo(videoElement) {
   addExpectedEvent();
   detectVideoPlaying(videoElement, function () { eventOccured(); });
 }
 
 function waitForVideoToStop(videoElement) {
   addExpectedEvent();
   detectVideoStopped(videoElement, function () { eventOccured(); });
 }
 
@@ skipping 41 matching lines @@
     failTest("expected '" + expected + "', got '" + actual + "'.");
   }
 }
 
 function assertNotEquals(expected, actual) {
   if (actual === expected) {
     failTest("expected '" + expected + "', got '" + actual + "'.");
   }
 }