Add chrome.power extension API.

chrome/browser/extensions/api/power/power_api_constants.h

Index: chrome/browser/extensions/api/power/power_api_constants.h
diff --git a/chrome/browser/extensions/api/power/power_api_constants.h b/chrome/browser/extensions/api/power/power_api_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..70181ee179fa8d0c2b9c0a213efde9d3df761a1f
--- /dev/null
+++ b/chrome/browser/extensions/api/power/power_api_constants.h
@@ -0,0 +1,20 @@
+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_POWER_POWER_API_CONSTANTS_H_
+#define CHROME_BROWSER_EXTENSIONS_API_POWER_POWER_API_CONSTANTS_H_
+
+// Constants used for the Power API.
+
+namespace extensions {
+namespace power_api_constants {
+
+// Values.
+extern const char kSystemLevelValue[];
+extern const char kDisplayLevelValue[];
+
+}  // namespace power_api_constants
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_POWER_POWER_API_CONSTANTS_H_