Implement the Blink part of the Device Motion API.

Source/core/core.gypi

 {
     'variables': {
         'core_idl_files': [
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSMediaRule.idl',
             'css/CSSPageRule.idl',
@@ skipping 2610 matching lines @@
             'platform/chromium/ClipboardChromium.h',
             'platform/chromium/ClipboardChromiumPosix.cpp',
             'platform/chromium/ClipboardChromiumWin.cpp',
             'platform/chromium/ClipboardMimeTypes.cpp',
             'platform/chromium/ClipboardMimeTypes.h',
             'platform/chromium/ClipboardUtilitiesChromium.cpp',
             'platform/chromium/ClipboardUtilitiesChromium.h',
             'platform/chromium/ContextMenuChromium.cpp',
             'platform/chromium/ContextMenuItemChromium.cpp',
             'platform/chromium/CursorChromium.cpp',
+            'platform/chromium/DeviceMotion.cpp',
             'platform/chromium/DragDataChromium.cpp',
             'platform/chromium/DragDataRef.h',
             'platform/chromium/DragImageChromiumSkia.cpp',
             'platform/chromium/DragImageRef.h',
             'platform/chromium/EventTracerChromium.cpp',
             'platform/chromium/FileSystemChromium.cpp',
             'platform/chromium/FileSystemChromiumLinux.cpp',
             'platform/chromium/FileSystemChromiumMac.mm',
             'platform/chromium/FileSystemChromiumWin.cpp',
             'platform/chromium/FramelessScrollView.cpp',
@@ skipping 41 matching lines @@
             'platform/chromium/SearchPopupMenuChromium.cpp',
             'platform/chromium/SearchPopupMenuChromium.h',
             'platform/chromium/SharedTimerChromium.cpp',
             'platform/chromium/SoundChromiumPosix.cpp',
             'platform/chromium/SoundChromiumWin.cpp',
             'platform/chromium/StatsCounterChromium.cpp',
             'platform/chromium/SuddenTerminationChromium.cpp',
             'platform/chromium/TraceEvent.h',
             'platform/chromium/VisitedLinksChromium.cpp',
             'platform/chromium/WidgetChromium.cpp',
+            'platform/chromium/support/WebDeviceMotionData.cpp',
+            'platform/chromium/support/WebDeviceMotionDispatcher.cpp',
+            'platform/chromium/support/WebDeviceMotionDispatcher.h',
             'platform/cocoa/KeyEventCocoa.h',
             'platform/cocoa/KeyEventCocoa.mm',
             'platform/graphics/ANGLEWebKitBridge.cpp',
             'platform/graphics/ANGLEWebKitBridge.h',
             'platform/graphics/BitmapImage.cpp',
             'platform/graphics/Color.cpp',
             'platform/graphics/CrossfadeGeneratedImage.cpp',
             'platform/graphics/CrossfadeGeneratedImage.h',
             'platform/graphics/Extensions3D.cpp',
             'platform/graphics/Extensions3D.h',
@@ skipping 996 matching lines @@
                 'bison_exe': 'bison',
                 # We specify a preprocess so it happens locally and won't get
                 # distributed to goma.
                 # FIXME: /usr/bin/gcc won't exist on OSX forever. We want to
                 # use /usr/bin/clang once we require Xcode 4.x.
                 'preprocessor': '--preprocessor "/usr/bin/gcc -E -P -x c++"'
               }],
          ],
     }
 }