WIP: <canvas> hit regions

Source/core/core.gypi

 {
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationPlayer.idl',
             'animation/TimedItem.idl',
             'animation/Timeline.idl',
             'animation/Timing.idl',
@@ skipping 2479 matching lines @@
             'html/ValidityState.cpp',
             'html/ValidityState.h',
             'html/canvas/ANGLEInstancedArrays.cpp',
             'html/canvas/ANGLEInstancedArrays.h',
             'html/canvas/Canvas2DContextAttributes.cpp',
             'html/canvas/Canvas2DContextAttributes.h',
             'html/canvas/CanvasContextAttributes.cpp',
             'html/canvas/CanvasContextAttributes.h',
             'html/canvas/CanvasGradient.cpp',
             'html/canvas/CanvasGradient.h',
+            'html/canvas/CanvasHitRegion.cpp',
+            'html/canvas/CanvasHitRegion.h',
             'html/canvas/CanvasImageSource.h',
             'html/canvas/CanvasPathMethods.cpp',
             'html/canvas/CanvasPathMethods.h',
             'html/canvas/CanvasPattern.cpp',
             'html/canvas/CanvasPattern.h',
             'html/canvas/CanvasRenderingContext.cpp',
             'html/canvas/CanvasRenderingContext.h',
             'html/canvas/CanvasRenderingContext2D.cpp',
             'html/canvas/CanvasRenderingContext2D.h',
             'html/canvas/CanvasStyle.cpp',
@@ skipping 881 matching lines @@
             'html/track/vtt/VTTScannerTest.cpp',
             'loader/MixedContentCheckerTest.cpp',
             'rendering/RenderOverflowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }