Use union type in ImageBitmapFactories.idl

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 1629 matching lines @@
             'frame/VisualViewport.cpp',
             'frame/VisualViewport.h',
             'frame/csp/CSPDirectiveList.cpp',
             'frame/csp/CSPSource.cpp',
             'frame/csp/CSPSourceList.cpp',
             'frame/csp/ContentSecurityPolicy.cpp',
             'frame/csp/MediaListDirective.cpp',
             'frame/csp/SourceListDirective.cpp',
             'imagebitmap/ImageBitmapFactories.cpp',
             'imagebitmap/ImageBitmapFactories.h',
+            'imagebitmap/ImageBitmapSource.cpp',
+            'imagebitmap/ImageBitmapSource.h',
             'inspector/AsyncCallChain.cpp',
             'inspector/AsyncCallChain.h',
             'inspector/AsyncCallTracker.cpp',
             'inspector/AsyncCallTracker.h',
             'inspector/AsyncOperationMap.h',
             'inspector/ConsoleAPITypes.h',
             'inspector/ConsoleMessage.cpp',
             'inspector/ConsoleMessage.h',
             'inspector/ConsoleMessageStorage.cpp',
             'inspector/ConsoleMessageStorage.h',
@@ skipping 2275 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }