Refactor Scroll Customization to share cc::ScrollStateData with blink.

third_party/WebKit/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 3657 matching lines @@
             'fileapi/FilePropertyBag.idl',
             'frame/ScrollOptions.idl',
             'frame/ScrollToOptions.idl',
             'html/AssignedNodesOptions.idl',
             'html/MediaKeyEventInit.idl',
             'html/canvas/CanvasContextCreationAttributes.idl',
             'html/track/TrackEventInit.idl',
             'imagebitmap/ImageBitmapOptions.idl',
             'input/InputDeviceCapabilitiesInit.idl',
             'page/EventSourceInit.idl',
+            'page/scrolling/ScrollStateInit.idl',
             'timing/PerformanceObserverInit.idl',
         ],
         'generated_core_dictionary_files': [
             '<(blink_core_output_dir)/animation/KeyframeEffectOptions.cpp',
             '<(blink_core_output_dir)/animation/KeyframeEffectOptions.h',
             '<(blink_core_output_dir)/animation/ComputedTimingProperties.cpp',
             '<(blink_core_output_dir)/animation/ComputedTimingProperties.h',
             '<(blink_core_output_dir)/css/FontFaceDescriptors.cpp',
             '<(blink_core_output_dir)/css/FontFaceDescriptors.h',
             '<(blink_core_output_dir)/css/FontFaceSetLoadEventInit.cpp',
@@ skipping 85 matching lines @@
             '<(blink_core_output_dir)/html/canvas/CanvasContextCreationAttributes.cpp',
             '<(blink_core_output_dir)/html/canvas/CanvasContextCreationAttributes.h',
             '<(blink_core_output_dir)/html/track/TrackEventInit.cpp',
             '<(blink_core_output_dir)/html/track/TrackEventInit.h',
             '<(blink_core_output_dir)/imagebitmap/ImageBitmapOptions.cpp',
             '<(blink_core_output_dir)/imagebitmap/ImageBitmapOptions.h',
             '<(blink_core_output_dir)/input/InputDeviceCapabilitiesInit.cpp',
             '<(blink_core_output_dir)/input/InputDeviceCapabilitiesInit.h',
             '<(blink_core_output_dir)/page/EventSourceInit.cpp',
             '<(blink_core_output_dir)/page/EventSourceInit.h',
+            '<(blink_core_output_dir)/page/scrolling/ScrollStateInit.cpp',
+            '<(blink_core_output_dir)/page/scrolling/ScrollStateInit.h',
             '<(blink_core_output_dir)/timing/PerformanceObserverInit.cpp',
             '<(blink_core_output_dir)/timing/PerformanceObserverInit.h',
         ],
         'core_testing_dictionary_idl_files': [
             'testing/InternalDictionary.idl',
             'testing/InternalDictionaryDerived.idl',
         ],
         'webcore_testing_idl_files': [
             'testing/DictionaryTest.idl',
             'testing/GCObservation.idl',
@@ skipping 265 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }