[SVG] DisplayList-based patterns.

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 541 matching lines @@
       'graphics/ColorSpace.h',
       'graphics/CompositingReasons.h',
       'graphics/CompositingReasons.cpp',
       'graphics/CrossfadeGeneratedImage.cpp',
       'graphics/CrossfadeGeneratedImage.h',
       'graphics/DecodingImageGenerator.cpp',
       'graphics/DecodingImageGenerator.h',
       'graphics/DeferredImageDecoder.cpp',
       'graphics/DeferredImageDecoder.h',
       'graphics/DisplayList.h',
+      'graphics/DisplayListPattern.cpp',
+      'graphics/DisplayListPattern.h',
       'graphics/DrawLooperBuilder.cpp',
       'graphics/DrawLooperBuilder.h',
       'graphics/FirstPaintInvalidationTracking.cpp',
       'graphics/FirstPaintInvalidationTracking.h',
       'graphics/FrameData.cpp',
       'graphics/FrameData.h',
       'graphics/GeneratedImage.cpp',
       'graphics/GeneratedImage.h',
       'graphics/Gradient.cpp',
       'graphics/Gradient.h',
@@ skipping 380 matching lines @@
       'graphics/ImageFrameGeneratorTest.cpp',
       'graphics/ImageLayerChromiumTest.cpp',
       'graphics/test/MockImageDecoder.h',
       'graphics/test/MockWebGraphicsContext3D.h',
       'image-decoders/gif/GIFImageDecoderTest.cpp',
       'image-decoders/jpeg/JPEGImageDecoderTest.cpp',
       'image-decoders/webp/WEBPImageDecoderTest.cpp',
     ],
   },
 }