Move overdraw tracking code from GraphicsContext to CanvasRenderingContext2D

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 3726 matching lines @@
             'frame/SubresourceIntegrityTest.cpp',
             'frame/csp/ContentSecurityPolicyTest.cpp',
             'html/HTMLDimensionTest.cpp',
             'html/HTMLFormControlElementTest.cpp',
             'html/HTMLInputElementTest.cpp',
             'html/HTMLLinkElementSizesAttributeTest.cpp',
             'html/HTMLSelectElementTest.cpp',
             'html/HTMLTextFormControlElementTest.cpp',
             'html/LinkRelAttributeTest.cpp',
             'html/TimeRangesTest.cpp',
+            'html/canvas/CanvasRenderingContext2DTest.cpp',
             'html/forms/FileInputTypeTest.cpp',
             'html/parser/HTMLParserThreadTest.cpp',
             'html/parser/HTMLSrcsetParserTest.cpp',
             'html/track/vtt/BufferedLineReaderTest.cpp',
             'html/track/vtt/VTTScannerTest.cpp',
             'layout/LayoutTableCellTest.cpp',
             'layout/LayoutTableRowTest.cpp',
             'layout/LayoutThemeTest.cpp',
             'layout/shapes/BoxShapeTest.cpp',
             'loader/LinkHeaderTest.cpp',
@@ skipping 17 matching lines @@
             'rendering/style/SVGRenderStyleTest.cpp',
             'streams/ExclusiveStreamReaderTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }