[DevTools] Add power profiler and power overview in timeline panel.

Source/core/inspector/InspectorFrontendHost.idl

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
@@ skipping 39 matching lines @@
     [Custom] void recordPanelShown(unsigned long panelCode);
     [Custom] void recordSettingChanged(unsigned long settingChanged);
 
     DOMString getSelectionBackgroundColor();
     DOMString getSelectionForegroundColor();
 
     DOMFileSystem isolatedFileSystem(DOMString fileSystemId, DOMString registeredName);
     void upgradeDraggedFileSystemPermissions(DOMFileSystem domFileSystem);
 
     boolean isUnderTest();
+
+    void checkPowerProfileSupportedStatus();

[pfeldman, 2014/01/09 11:38:52]

These should not be defined in the front-end embedder interface, but rather be
exposed as a part of the remote debugging protocol. The rationale is that you
should query power data from the target device, not necessarily the device that
renders the front-end. You could either declare a new domain "Power" in the
protocol.json for that or make power data sent along with the timeline records.

+    void startPowerProfile();
+    void stopPowerProfile();
+    void setPowerProfileResolution(unsigned long resolution);
 };