Update Window API for CSSOM smooth scrolling to match the spec

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 3374 matching lines @@
             'svg/properties/SVGAnimatedProperty.cpp',
             'svg/properties/SVGPropertyTearOff.cpp',
         ],
         'core_dictionary_idl_files': [
             'css/FontFaceDescriptors.idl',
             'dom/DOMPointInit.idl',
             'dom/ElementRegistrationOptions.idl',
             'dom/MutationObserverInit.idl',
             'events/EventInit.idl',
             'frame/ScrollOptions.idl',
+            'frame/ScrollToOptions.idl',
             'html/canvas/HitRegionOptions.idl',
             'page/EventSourceInit.idl',
         ],
         'generated_core_dictionary_files': [
             '<(blink_core_output_dir)/css/FontFaceDescriptors.cpp',
             '<(blink_core_output_dir)/css/FontFaceDescriptors.h',
             '<(blink_core_output_dir)/dom/DOMPointInit.cpp',
             '<(blink_core_output_dir)/dom/DOMPointInit.h',
             '<(blink_core_output_dir)/dom/ElementRegistrationOptions.cpp',
             '<(blink_core_output_dir)/dom/ElementRegistrationOptions.h',
             '<(blink_core_output_dir)/dom/MutationObserverInit.cpp',
             '<(blink_core_output_dir)/dom/MutationObserverInit.h',
             '<(blink_core_output_dir)/events/EventInitDictionary.cpp',
             '<(blink_core_output_dir)/events/EventInitDictionary.h',
             '<(blink_core_output_dir)/frame/ScrollOptions.cpp',
             '<(blink_core_output_dir)/frame/ScrollOptions.h',
+            '<(blink_core_output_dir)/frame/ScrollToOptions.cpp',
+            '<(blink_core_output_dir)/frame/ScrollToOptions.h',
             '<(blink_core_output_dir)/html/canvas/HitRegionOptions.cpp',
             '<(blink_core_output_dir)/html/canvas/HitRegionOptions.h',
             '<(blink_core_output_dir)/page/EventSourceInit.cpp',
             '<(blink_core_output_dir)/page/EventSourceInit.h',
         ],
         'core_testing_dictionary_idl_files': [
             'testing/InternalDictionary.idl',
             'testing/InternalDictionaryDerived.idl',
             'testing/PluginPlaceholderOptions.idl',
         ],
@@ skipping 170 matching lines @@
             'rendering/style/OutlineValueTest.cpp',
             'rendering/style/RenderStyleTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }