Create chrome://device-emulator and add the ability to get a battery percentage and send an updated…

chrome/browser/resources/chromeos/emulator/device_emulator.css

Index: chrome/browser/resources/chromeos/emulator/device_emulator.css
diff --git a/chrome/browser/resources/chromeos/emulator/device_emulator.css b/chrome/browser/resources/chromeos/emulator/device_emulator.css
new file mode 100644
index 0000000000000000000000000000000000000000..ac6a09af2a74b862ef1901614b503f14905ddbdb
--- /dev/null
+++ b/chrome/browser/resources/chromeos/emulator/device_emulator.css
@@ -0,0 +1,26 @@
+/* Copyright 2015 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. */
+
+h1 {
+  font-family: Verdana, Helvetica;
+}
+
+/* Form Styles */
+.container {
+  margin: 0 auto;
+  width: 1000px;
+}
+
+.control-group,
+.form-group,
+.group-body,
+.group-header {
+  float: left;
+}
+
+.control-group {
+  display: inline-block;
+  margin: 10px 0;
+  width: 100%;
+}