Implementing ACCELERATED_COMPOSITING via Skia

WebCore/WebCore.gypi

 {
     'variables': {
         'webcore_bindings_idl_files': [
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSMediaRule.idl',
             'css/CSSPageRule.idl',
             'css/CSSPrimitiveValue.idl',
             'css/CSSRule.idl',
@@ skipping 2131 matching lines @@
             'platform/graphics/qt/StillImageQt.cpp',
             'platform/graphics/qt/StillImageQt.h',
             'platform/graphics/qt/TransformationMatrixQt.cpp',
             'platform/graphics/skia/BitmapImageSingleFrameSkia.h',
             'platform/graphics/skia/FloatPointSkia.cpp',
             'platform/graphics/skia/FloatRectSkia.cpp',
             'platform/graphics/skia/GradientSkia.cpp',
             'platform/graphics/skia/GraphicsContextPlatformPrivate.h',
             'platform/graphics/skia/GraphicsContextSkia.cpp',
             'platform/graphics/skia/GraphicsContext3DSkia.cpp',
+            'platform/graphics/skia/GraphicsLayerSkia.cpp',
+            'platform/graphics/skia/GraphicsLayerSkia.h',
             'platform/graphics/skia/ImageBufferSkia.cpp',
             'platform/graphics/skia/ImageSkia.cpp',
             'platform/graphics/skia/IntPointSkia.cpp',
             'platform/graphics/skia/IntRectSkia.cpp',
+            'platform/graphics/skia/LayerRendererSkia.cpp',
+            'platform/graphics/skia/LayerRendererSkia.h',
+            'platform/graphics/skia/LayerSkia.cpp',
+            'platform/graphics/skia/LayerSkia.h',
             'platform/graphics/skia/NativeImageSkia.cpp',
             'platform/graphics/skia/NativeImageSkia.h',
             'platform/graphics/skia/PathSkia.cpp',
             'platform/graphics/skia/PatternSkia.cpp',
             'platform/graphics/skia/PlatformContextSkia.cpp',
             'platform/graphics/skia/PlatformContextSkia.h',
             'platform/graphics/skia/PlatformGraphics.h',
             'platform/graphics/skia/SkiaFontWin.cpp',
             'platform/graphics/skia/SkiaFontWin.h',
             'platform/graphics/skia/SkiaUtils.cpp',
@@ skipping 1793 matching lines @@
             'inspector/front-end/Images/userInputPreviousIcon.png',
             'inspector/front-end/Images/userInputResultIcon.png',
             'inspector/front-end/Images/warningIcon.png',
             'inspector/front-end/Images/warningOrangeDot.png',
             'inspector/front-end/Images/warningMediumIcon.png',
             'inspector/front-end/Images/warningsErrors.png',
             'inspector/front-end/Images/whiteConnectorPoint.png'
         ],
     }
 }