Add chrome.power extension API.

chrome/common/extensions/api/power.idl

+// Copyright (c) 2013 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.
+
+// An API that can be used to override the system's power management
+// features.
+[permissions=power]
+namespace power {
+  interface Functions {
+    // Requests that power management be temporarily disabled. |level|

[not at google - send to devlin, 2013/03/19 21:16:39]

Should level be an enum?

[Daniel Erat, 2013/03/19 23:39:38]

Done.

+    // describes the degree to which power management should be disabled;
+    // "system" prevents the system from sleeping in response to user
+    // inactivity while "display" additionally prevents the display from
+    // being dimmed or turned off.
+    static void requestKeepAwake(optional DOMString level);
+
+    // Releases a request previously made via requestKeepAwake().
+    static void releaseKeepAwake();
+  };
+};