Initial implementation of display list backed 2D canvases

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 611 matching lines @@
       'graphics/OpaqueRectTrackingContentLayerDelegate.cpp',
       'graphics/OpaqueRectTrackingContentLayerDelegate.h',
       'graphics/Path.cpp',
       'graphics/Path.h',
       'graphics/PathTraversalState.cpp',
       'graphics/PathTraversalState.h',
       'graphics/Pattern.cpp',
       'graphics/Pattern.h',
       'graphics/ProfilingCanvas.cpp',
       'graphics/ProfilingCanvas.h',
+      'graphics/RecordingImageBufferSurface.cpp',
+      'graphics/RecordingImageBufferSurface.h',
       'graphics/ReplayingCanvas.cpp',
       'graphics/ReplayingCanvas.h',
       'graphics/ScaledImageFragment.cpp',
       'graphics/ScaledImageFragment.h',
       'graphics/StrokeData.cpp',
       'graphics/StrokeData.h',
       'graphics/ThreadSafeDataTransport.cpp',
       'graphics/ThreadSafeDataTransport.h',
       'graphics/UnacceleratedImageBufferSurface.cpp',
       'graphics/UnacceleratedImageBufferSurface.h',
@@ skipping 313 matching lines @@
       'graphics/ImageLayerChromiumTest.cpp',
       'graphics/OpaqueRectTrackingContentLayerDelegateTest.cpp',
       'graphics/test/MockImageDecoder.h',
       'graphics/test/MockWebGraphicsContext3D.h',
       'image-decoders/gif/GIFImageDecoderTest.cpp',
       'image-decoders/jpeg/JPEGImageDecoderTest.cpp',
       'image-decoders/webp/WEBPImageDecoderTest.cpp',
     ],
   },
 }