Split VTTCue from TextTrackCue

Source/bindings/bindings.gypi

 {
     'variables': {
         'bindings_dir': ['.'],
         'bindings_files': [
             'v8/ActiveDOMCallback.cpp',
             'v8/ActiveDOMCallback.h',
             'v8/ArrayValue.cpp',
             'v8/ArrayValue.h',
             'v8/BindingSecurity.cpp',
             'v8/BindingSecurity.h',
@@ skipping 201 matching lines @@
             'v8/custom/V8PopStateEventCustom.cpp',
             'v8/custom/V8PromiseCustom.cpp',
             'v8/custom/V8SQLResultSetRowListCustom.cpp',
             'v8/custom/V8SQLTransactionCustom.cpp',
             'v8/custom/V8SQLTransactionSyncCustom.cpp',
             'v8/custom/V8SVGElementCustom.cpp',
             'v8/custom/V8SVGLengthCustom.cpp',
             'v8/custom/V8SVGPathSegCustom.cpp',
             'v8/custom/V8StyleSheetCustom.cpp',
             'v8/custom/V8TextCustom.cpp',
+            'v8/custom/V8TextTrackCueCustom.cpp',
             'v8/custom/V8TrackEventCustom.cpp',
             'v8/custom/V8TypedArrayCustom.h',
             'v8/custom/V8Uint8ArrayCustom.h',
             'v8/custom/V8Uint8ClampedArrayCustom.h',
             'v8/custom/V8Uint16ArrayCustom.h',
             'v8/custom/V8Uint32ArrayCustom.h',
             'v8/custom/V8WebGLRenderingContextCustom.cpp',
             'v8/custom/V8WebKitPointCustom.cpp',
             'v8/custom/V8WindowCustom.cpp',
             'v8/custom/V8WorkerGlobalScopeCustom.cpp',
@@ skipping 34 matching lines @@
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources15.cpp',
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources16.cpp',
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources17.cpp',
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources18.cpp',
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources19.cpp',
                 ],
             }],
         ],
     },
 }