Slimming Paint phase 2 compositing algorithm plumbing

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 983 matching lines @@
             'clipboard/DataTransfer.cpp',
             'clipboard/DataTransfer.h',
             'clipboard/DataTransferItem.cpp',
             'clipboard/DataTransferItem.h',
             'clipboard/DataTransferItemList.cpp',
             'clipboard/DataTransferItemList.h',
             'clipboard/DraggedIsolatedFileSystem.cpp',
             'clipboard/DraggedIsolatedFileSystem.h',
             'clipboard/Pasteboard.cpp',
             'clipboard/Pasteboard.h',
+            'compositing/DisplayListCompositingBuilder.cpp',
+            'compositing/DisplayListCompositingBuilder.h',
             'css/BasicShapeFunctions.cpp',
             'css/BinaryDataFontFaceSource.cpp',
             'css/BinaryDataFontFaceSource.h',
             'css/CSSBasicShapes.cpp',
             'css/CSSBorderImage.cpp',
             'css/CSSBorderImage.h',
             'css/CSSBorderImageSliceValue.cpp',
             'css/CSSBorderImageSliceValue.h',
             'css/CSSCalculationValue.cpp',
             'css/CSSCalculationValue.h',
@@ skipping 2672 matching lines @@
             'animation/animatable/AnimatableDoubleAndBoolTest.cpp',
             'animation/animatable/AnimatableDoubleTest.cpp',
             'animation/animatable/AnimatableLengthTest.cpp',
             'animation/animatable/AnimatableNeutralTest.cpp',
             'animation/animatable/AnimatableStrokeDasharrayListTest.cpp',
             'animation/animatable/AnimatableUnknownTest.cpp',
             'animation/animatable/AnimatableValueTestHelper.cpp',
             'animation/animatable/AnimatableValueTestHelper.h',
             'animation/animatable/AnimatableValueTestHelperTest.cpp',
             'clipboard/DataObjectTest.cpp',
+            'compositing/DisplayListCompositingBuilderTest.cpp',
             'css/AffectedByFocusTest.cpp',
             'css/CSSCalculationValueTest.cpp',
             'css/CSSFontFaceTest.cpp',
             'css/CSSSelectorTest.cpp',
             'css/CSSTestHelper.cpp',
             'css/CSSTestHelper.h',
             'css/CSSValueTestHelper.h',
             'css/DragUpdateTest.cpp',
             'css/MediaQueryEvaluatorTest.cpp',
             'css/MediaQueryListTest.cpp',
@@ skipping 112 matching lines @@
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }