Use local pages for webrtc telemetry tests.

tools/perf/page_sets/webrtc_cases/peerconnection_canvas_capture_files/main.css

+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+.drop-down {
+  width: 65%;
+  font-size: 10px;
+  white-space: nowrap
+}
+
+.constraints {
+  width: 75%;
+  height: auto;
+  position: absolute;
+  overflow: scroll;
+  display: none;
+}
+
+.float-left {
+  float: left;
+  width: 100%;
+}
+
+.float-clear-left {
+  float: left;
+  clear: left;
+  width: 100%;
+}
+
+.top-border {
+  border-top: 4px solid grey;
+}
+
+.bottom-border {
+  border-bottom: 4px solid grey;
+}
+
+#messages {
+  word-wrap: break-word;
+  white-space: pre-wrap;
+  font-size: 0.7em;
+}
+
+#audio-source {
+  float: left;
+  width: 50%;
+}
+
+#video-source {
+  margin-left: 50%;
+  width: 50%;
+}
+
+#video-res {
+  width: 30%;
+}
+
+#signal-server {
+  float: left;
+  width: 60%;
+}
+
+#pc-server {
+  width: 98%;
+  margin-left: 0.1em;
+  margin-top: 0.1em;
+}
+
+#peer-id-container {
+  margin-left: 60%;
+  height: 1.5em;
+}
+
+#peer-id {
+  margin-top: 0.1em;
+  width: 7em;
+}
+
+#pc-server-label {
+  width: 15%;
+}
+
+#pc-server-container {
+  position: absolute;
+  margin: 0 0 0 12%;
+  width: 40%;
+  overflow: hidden;
+  height: 1.5em;
+}
+
+#pc-constraints-left {
+  margin: 0.7em 0 0 0;
+  width: 60%;
+}
+
+#call {
+  float: left;
+  margin: 0.7em 0 0 0;
+}
+
+.float-left {
+  float: left;
+  width: 100%;
+}
+
+.float-clear-left {
+  float: left;
+  clear: left;
+  width: 100%;
+}
+
+.small-input {
+  width: 3em;
+}
+
+.medium-input {
+  width: 6em;
+}
+
+#screencapture-info {
+  margin: 1% auto; /* 15% from the top and centered */
+  width: 100%; /* Could be more or less, depending on screen size */
+}
+
+a {
+  color: lightBlue;
+  font-weight: 300;
+  text-decoration: none;
+}
+
+a:hover {
+  color: blue;
+  text-decoration: underline;
+}
+
+body {
+  font-family: 'Roboto', sans-serif;
+  margin: 0;
+  padding: 1em;
+  word-wrap: break-word;
+}
+
+button {
+  background-color: grey;
+  border: none;
+  border-radius: 1px;
+  color: white;
+  font-family: 'Roboto', sans-serif;
+  font-size: 0.8em;
+  margin: 0 0 1em 0;
+  padding: 0.2em;
+}
+
+button:hover {
+  background-color: darkGrey;
+}
+
+button.green {
+  background: darkGreen;
+  color: white;
+}
+
+button.green:hover {
+  background: forestGreen;
+  color: white;
+}
+
+button.red {
+  background: darkRed;
+  color: white;
+}
+
+button.red:hover {
+  background: fireBrick;
+}
+
+button.pressed {
+background-color: black;
+}
+
+div#container {
+  margin: 0 auto 0 auto;
+  max-width: 40em;
+  padding: 0 1.5em 1.3em 1.5em;
+  z-index: 2;
+  position: relative;
+}
+
+h2 {
+  color: black;
+  font-size: 1em;
+  font-weight: 700;
+  line-height: 1.2em;
+  margin: 0 0 0.8em 0;
+}
+
+div {
+  background: white;
+}
+
+html {
+  /* avoid annoying page width change
+  when moving from the home page.*/
+  overflow-y: scroll;
+}
+
+select {
+  margin: 0 1em 1em 0;
+  position: relative;
+  top: -1px;
+}
+
+video {
+  background: black;
+  width: 100%;
+}
+
+#log {
+  float: left;
+  position: fixed;
+  overflow: auto;
+  top: 0;
+  left: 0;
+  width: 20%;
+  padding: 16px;
+  word-wrap: break-word;
+  z-index: 1;
+}
+
+@media screen and (max-width: 1200px) {
+  div#log {
+    float: none;
+    width: 100%;
+    position: inherit;
+    padding: 0;
+  }
+  button {
+    padding: 0.7em;
+  }
+  button:active {
+    background: black;
+  }
+  #pc-server-label {
+    margin-top: 5px;
+  }
+  #pc-server-container {
+    margin-top: 5px;
+  }
+}