Implement onunhandledrejection / onrejectionhandled events

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 100 matching lines @@
             'events/HashChangeEvent.idl',
             'events/KeyboardEvent.idl',
             'events/MessageEvent.idl',
             'events/MouseEvent.idl',
             'events/MutationEvent.idl',
             'events/OverflowEvent.idl',
             'events/PageTransitionEvent.idl',
             'events/PointerEvent.idl',
             'events/PopStateEvent.idl',
             'events/ProgressEvent.idl',
+            'events/PromiseRejectionEvent.idl',
             'events/RelatedEvent.idl',
             'events/ResourceProgressEvent.idl',
             'events/SecurityPolicyViolationEvent.idl',
             'events/TextEvent.idl',
             'events/TouchEvent.idl',
             'events/TransitionEvent.idl',
             'events/UIEvent.idl',
             'events/WheelEvent.idl',
             'fileapi/Blob.idl',
             'fileapi/File.idl',
@@ skipping 388 matching lines @@
             'events/HashChangeEvent.idl',
             'events/KeyboardEvent.idl',
             'events/MessageEvent.idl',
             'events/MouseEvent.idl',
             'events/MutationEvent.idl',
             'events/OverflowEvent.idl',
             'events/PageTransitionEvent.idl',
             'events/PointerEvent.idl',
             'events/PopStateEvent.idl',
             'events/ProgressEvent.idl',
+            'events/PromiseRejectionEvent.idl',
             'events/RelatedEvent.idl',
             'events/ResourceProgressEvent.idl',
             'events/SecurityPolicyViolationEvent.idl',
             'events/TextEvent.idl',
             'events/TouchEvent.idl',
             'events/TransitionEvent.idl',
             'events/UIEvent.idl',
             'events/WheelEvent.idl',
             'html/MediaKeyEvent.idl',
             'html/canvas/WebGLContextEvent.idl',
@@ skipping 1978 matching lines @@
             'events/OverflowEvent.cpp',
             'events/OverflowEvent.h',
             'events/PageTransitionEvent.cpp',
             'events/PageTransitionEvent.h',
             'events/PointerEvent.cpp',
             'events/PointerEvent.h',
             'events/PopStateEvent.cpp',
             'events/PopStateEvent.h',
             'events/ProgressEvent.cpp',
             'events/ProgressEvent.h',
+            'events/PromiseRejectionEvent.cpp',
+            'events/PromiseRejectionEvent.h',
             'events/RelatedEvent.cpp',
             'events/RelatedEvent.h',
             'events/ResourceProgressEvent.cpp',
             'events/ResourceProgressEvent.h',
             'events/ScopedEventQueue.cpp',
             'events/ScopedEventQueue.h',
             'events/SecurityPolicyViolationEvent.h',
             'events/TextEvent.cpp',
             'events/TextEvent.h',
             'events/ThreadLocalEventNames.h',
@@ skipping 1054 matching lines @@
             'events/FocusEventInit.idl',
             'events/HashChangeEventInit.idl',
             'events/KeyboardEventInit.idl',
             'events/MessageEventInit.idl',
             'events/MouseEventInit.idl',
             'events/OverflowEventInit.idl',
             'events/PageTransitionEventInit.idl',
             'events/PointerEventInit.idl',
             'events/PopStateEventInit.idl',
             'events/ProgressEventInit.idl',
+            'events/PromiseRejectionEventInit.idl',
             'events/RelatedEventInit.idl',
             'events/SecurityPolicyViolationEventInit.idl',
             'events/TransitionEventInit.idl',
             'events/UIEventInit.idl',
             'events/WheelEventInit.idl',
             'fileapi/BlobPropertyBag.idl',
             'fileapi/FilePropertyBag.idl',
             'frame/StateOptions.idl',
             'frame/ScrollOptions.idl',
             'frame/ScrollToOptions.idl',
@@ skipping 57 matching lines @@
             '<(blink_core_output_dir)/events/OverflowEventInit.cpp',
             '<(blink_core_output_dir)/events/OverflowEventInit.h',
             '<(blink_core_output_dir)/events/PageTransitionEventInit.cpp',
             '<(blink_core_output_dir)/events/PageTransitionEventInit.h',
             '<(blink_core_output_dir)/events/PointerEventInit.cpp',
             '<(blink_core_output_dir)/events/PointerEventInit.h',
             '<(blink_core_output_dir)/events/PopStateEventInit.cpp',
             '<(blink_core_output_dir)/events/PopStateEventInit.h',
             '<(blink_core_output_dir)/events/ProgressEventInit.cpp',
             '<(blink_core_output_dir)/events/ProgressEventInit.h',
+            '<(blink_core_output_dir)/events/PromiseRejectionEventInit.cpp',
+            '<(blink_core_output_dir)/events/PromiseRejectionEventInit.h',
             '<(blink_core_output_dir)/events/RelatedEventInit.cpp',
             '<(blink_core_output_dir)/events/RelatedEventInit.h',
             '<(blink_core_output_dir)/events/SecurityPolicyViolationEventInit.cpp',
             '<(blink_core_output_dir)/events/SecurityPolicyViolationEventInit.h',
             '<(blink_core_output_dir)/events/TransitionEventInit.cpp',
             '<(blink_core_output_dir)/events/TransitionEventInit.h',
             '<(blink_core_output_dir)/events/UIEventInit.cpp',
             '<(blink_core_output_dir)/events/UIEventInit.h',
             '<(blink_core_output_dir)/events/WheelEventInit.cpp',
             '<(blink_core_output_dir)/events/WheelEventInit.h',
@@ skipping 250 matching lines @@
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }