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

Source/devtools/devtools.gyp

 #
 # Copyright (C) 2013 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
 # notice, this list of conditions and the following disclaimer.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 110 matching lines @@
             'front_end/InspectElementModeController.js',
             'front_end/Object.js',
             'front_end/ObjectPopoverHelper.js',
             'front_end/ObjectPropertiesSection.js',
             'front_end/OverridesSupport.js',
             'front_end/OverviewGrid.js',
             'front_end/Panel.js',
             'front_end/ParsedURL.js',
             'front_end/Placard.js',
             'front_end/Popover.js',
+            'front_end/PowerProfiler.js',
             'front_end/PresentationConsoleMessageHelper.js',
             'front_end/ProfilesPanelDescriptor.js',
             'front_end/Progress.js',
             'front_end/ProgressIndicator.js',
             'front_end/PropertiesSection.js',
             'front_end/RemoteObject.js',
             'front_end/Resource.js',
             'front_end/ResourceScriptMapping.js',
             'front_end/ResourceTreeModel.js',
             'front_end/ResourceType.js',
@@ skipping 784 matching lines @@
                         'destination': '<(PRODUCT_DIR)/resources/inspector',
                         'files': [
                             '<@(devtools_standalone_files)',
                         ],
                     }],
                 },
             ],
         }],
     ], # conditions
 }