Use local pages for webrtc telemetry tests.

tools/perf/page_sets/webrtc_cases/resolution.js

+/*
+ * Copyright 2017 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.
+ */
+'use strict';
+
+var dimensions = document.querySelector('#dimensions');
+var video = document.querySelector('video');
+var stream;
+
+var vgaButton = document.querySelector('#vga');
+var qvgaButton = document.querySelector('#qvga');
+var hdButton = document.querySelector('#hd');
+var fullHdButton = document.querySelector('#full-hd');
+
+vgaButton.onclick = function() {
+  getMedia(vgaConstraints);
+};
+
+qvgaButton.onclick = function() {
+  getMedia(qvgaConstraints);
+};
+
+hdButton.onclick = function() {
+  getMedia(hdConstraints);
+};
+
+fullHdButton.onclick = function() {
+  getMedia(fullHdConstraints);
+};
+
+var qvgaConstraints = {
+  video: {width: {exact: 320}, height: {exact: 240}}
+};
+
+var vgaConstraints = {
+  video: {width: {exact: 640}, height: {exact: 480}}
+};
+
+var hdConstraints = {
+  video: {width: {exact: 1280}, height: {exact: 720}}
+};
+
+var fullHdConstraints = {
+  video: {width: {exact: 1920}, height: {exact: 1080}}
+};
+
+function gotStream(mediaStream) {
+  window.stream = mediaStream; // stream available to console
+  video.srcObject = mediaStream;
+}
+
+function displayVideoDimensions() {
+  if (!video.videoWidth) {
+    setTimeout(displayVideoDimensions, 500);
+  }
+  dimensions.innerHTML = 'Actual video dimensions: ' + video.videoWidth +
+    'x' + video.videoHeight + 'px.';
+}
+
+video.onloadedmetadata = displayVideoDimensions;
+
+function getMedia(constraints) {
+  if (stream) {
+    stream.getTracks().forEach(function(track) {
+      track.stop();
+    });
+  }
+
+  navigator.mediaDevices.getUserMedia(constraints)
+  .then(gotStream)
+  .catch(function(e) {
+    var message = 'getUserMedia error: ' + e.name;
+    alert(message);
+    console.log(message);
+  });
+}