Initial implementation of API WakeLock.

Source/modules/wake_lock/WakeLock.idl

Index: Source/modules/wake_lock/WakeLock.idl
diff --git a/Source/modules/wake_lock/WakeLock.idl b/Source/modules/wake_lock/WakeLock.idl
new file mode 100644
index 0000000000000000000000000000000000000000..696b9d6d1467e7c0a4adb84baffdfcc8eb39d83f
--- /dev/null
+++ b/Source/modules/wake_lock/WakeLock.idl
@@ -0,0 +1,17 @@
+// Copyright 2014 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.
+
+enum WakeLockType {
+    "screen",
+    "system"
+};
+
+[
+    RuntimeEnabled=WakeLock,
+    WillBeGarbageCollected,
+] interface WakeLock {
+    [CallWith=ScriptState] Promise request(WakeLockType type);
+    [CallWith=ScriptState] Promise release(WakeLockType type);
+    boolean isHeld(WakeLockType type);
+};