Implement clip and scroll DisplayItems for PartPainter

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 1477 matching lines @@
             'paint/BlockPainter.cpp',
             'paint/BlockPainter.h',
             'paint/BoxClipper.cpp',
             'paint/BoxClipper.h',
             'paint/BoxDecorationData.cpp',
             'paint/BoxDecorationData.h',
             'paint/BoxPainter.cpp',
             'paint/BoxPainter.h',
             'paint/CompositingRecorder.cpp',
             'paint/CompositingRecorder.h',
+            'paint/ContentBoxRadiusClipper.cpp',
+            'paint/ContentBoxRadiusClipper.h',
             'paint/DetailsMarkerPainter.cpp',
             'paint/DetailsMarkerPainter.h',
             'paint/RenderDrawingRecorder.cpp',
             'paint/RenderDrawingRecorder.h',
             'paint/EllipsisBoxPainter.cpp',
             'paint/EllipsisBoxPainter.h',
             'paint/FieldsetPainter.cpp',
             'paint/FieldsetPainter.h',
             'paint/FileUploadControlPainter.cpp',
             'paint/FileUploadControlPainter.h',
@@ skipping 2246 matching lines @@
             'rendering/style/RenderStyleTest.cpp',
             'rendering/style/SVGRenderStyleTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }