Implement the Blink part of the Device Motion API.

Source/WebKit/chromium/WebKit.gyp

 #
 # Copyright (C) 2011 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 96 matching lines @@
                 'public/WebDataSource.h',
                 'public/WebDatabase.h',
                 'public/WebDatabaseObserver.h',
                 'public/WebDateTimeInputType.h',
                 'public/WebDateTimeChooserCompletion.h',
                 'public/WebDateTimeChooserParams.h',
                 'public/WebDevToolsAgent.h',
                 'public/WebDevToolsAgentClient.h',
                 'public/WebDevToolsFrontend.h',
                 'public/WebDevToolsFrontendClient.h',
+                'public/WebDeviceMotionData.h'
+                'public/WebDeviceMotionHandler.h',
+                'public/WebDeviceMotionListener.h',
                 'public/WebDeviceOrientation.h',
                 'public/WebDeviceOrientationClient.h',
                 'public/WebDeviceOrientationClientMock.h',
                 'public/WebDeviceOrientationController.h',
                 'public/WebDocument.h',
                 'public/WebDocumentType.h',
                 'public/WebEditingAction.h',
                 'public/WebElement.h',
                 'public/WebExceptionCode.h',
                 'public/WebExternalPopupMenu.h',
@@ skipping 705 matching lines @@
         ['clang==1', {
             'target_defaults': {
                 'cflags': ['-Wglobal-constructors'],
                 'xcode_settings': {
                     'WARNING_CFLAGS': ['-Wglobal-constructors'],
                 },
             },
         }],
     ], # conditions
 }