Enumerate the return value of dispatchEvent so it is clear.

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 2630 matching lines @@
             'events/DOMWindowEventQueue.h',
             'events/DragEvent.cpp',
             'events/DragEvent.h',
             'events/ErrorEvent.cpp',
             'events/ErrorEvent.h',
             'events/Event.cpp',
             'events/EventDispatchMediator.cpp',
             'events/EventDispatchMediator.h',
             'events/EventDispatcher.cpp',
             'events/EventDispatcher.h',
+            'events/EventDispatchResult.h',
             'events/EventListenerMap.cpp',
             'events/EventPath.cpp',
             'events/EventPath.h',
             'events/EventQueue.h',
             'events/EventSender.h',
             'events/EventTarget.cpp',
             'events/FocusEvent.cpp',
             'events/FocusEvent.h',
             'events/GenericEventQueue.cpp',
             'events/GenericEventQueue.h',
@@ skipping 1371 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }