Implement DragEvent and move MouseEvent.dataTransfer

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 86 matching lines @@
             'dom/shadow/ShadowRoot.idl',
             'editing/Selection.idl',
             'events/AnimationEvent.idl',
             'events/AnimationPlayerEvent.idl',
             'events/ApplicationCacheErrorEvent.idl',
             'events/AutocompleteErrorEvent.idl',
             'events/BeforeUnloadEvent.idl',
             'events/ClipboardEvent.idl',
             'events/CompositionEvent.idl',
             'events/CustomEvent.idl',
+            'events/DragEvent.idl',
             'events/ErrorEvent.idl',
             'events/Event.idl',
             'events/EventTarget.idl',
             'events/FocusEvent.idl',
             'events/HashChangeEvent.idl',
             'events/KeyboardEvent.idl',
             'events/MessageEvent.idl',
             'events/MutationEvent.idl',
             'events/PageTransitionEvent.idl',
             'events/PointerEvent.idl',
@@ skipping 342 matching lines @@
             'css/FontFaceSetLoadEvent.idl',
             'css/MediaQueryListEvent.idl',
             'events/AnimationEvent.idl',
             'events/AnimationPlayerEvent.idl',
             'events/ApplicationCacheErrorEvent.idl',
             'events/AutocompleteErrorEvent.idl',
             'events/BeforeUnloadEvent.idl',
             'events/ClipboardEvent.idl',
             'events/CompositionEvent.idl',
             'events/CustomEvent.idl',
+            'events/DragEvent.idl',
             'events/ErrorEvent.idl',
             'events/Event.idl',
             'events/FocusEvent.idl',
             'events/HashChangeEvent.idl',
             'events/KeyboardEvent.idl',
             'events/MessageEvent.idl',
             'events/MouseEvent.idl',
             'events/MutationEvent.idl',
             'events/PageTransitionEvent.idl',
             'events/PointerEvent.idl',
@@ skipping 2001 matching lines @@
             'events/BeforeUnloadEvent.cpp',
             'events/BeforeUnloadEvent.h',
             'events/ClipboardEvent.cpp',
             'events/ClipboardEvent.h',
             'events/CompositionEvent.cpp',
             'events/CompositionEvent.h',
             'events/CustomEvent.cpp',
             'events/CustomEvent.h',
             'events/DOMWindowEventQueue.cpp',
             '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/EventListenerMap.cpp',
             'events/EventPath.cpp',
             'events/EventPath.h',
@@ skipping 960 matching lines @@
             'dom/DOMPointInit.idl',
             'dom/ElementRegistrationOptions.idl',
             'dom/MutationObserverInit.idl',
             'dom/shadow/ShadowRootInit.idl',
             'events/AnimationEventInit.idl',
             'events/AnimationPlayerEventInit.idl',
             'events/ApplicationCacheErrorEventInit.idl',
             'events/AutocompleteErrorEventInit.idl',
             'events/CompositionEventInit.idl',
             'events/CustomEventInit.idl',
+            'events/DragEventInit.idl',
             'events/ErrorEventInit.idl',
             'events/EventInit.idl',
             'events/EventModifierInit.idl',
             'events/FocusEventInit.idl',
             'events/HashChangeEventInit.idl',
             'events/KeyboardEventInit.idl',
             'events/MessageEventInit.idl',
             'events/MouseEventInit.idl',
             'events/PageTransitionEventInit.idl',
             'events/PointerEventInit.idl',
@@ skipping 39 matching lines @@
             '<(blink_core_output_dir)/events/AnimationPlayerEventInit.cpp',
             '<(blink_core_output_dir)/events/AnimationPlayerEventInit.h',
             '<(blink_core_output_dir)/events/ApplicationCacheErrorEventInit.cpp',
             '<(blink_core_output_dir)/events/ApplicationCacheErrorEventInit.h',
             '<(blink_core_output_dir)/events/AutocompleteErrorEventInit.cpp',
             '<(blink_core_output_dir)/events/AutocompleteErrorEventInit.h',
             '<(blink_core_output_dir)/events/CompositionEventInit.cpp',
             '<(blink_core_output_dir)/events/CompositionEventInit.h',
             '<(blink_core_output_dir)/events/CustomEventInit.cpp',
             '<(blink_core_output_dir)/events/CustomEventInit.h',
+            '<(blink_core_output_dir)/events/DragEventInit.cpp',
+            '<(blink_core_output_dir)/events/DragEventInit.h',
             '<(blink_core_output_dir)/events/ErrorEventInit.cpp',
             '<(blink_core_output_dir)/events/ErrorEventInit.h',
             '<(blink_core_output_dir)/events/EventInit.cpp',
             '<(blink_core_output_dir)/events/EventInit.h',
             '<(blink_core_output_dir)/events/EventModifierInit.cpp',
             '<(blink_core_output_dir)/events/EventModifierInit.h',
             '<(blink_core_output_dir)/events/FocusEventInit.cpp',
             '<(blink_core_output_dir)/events/FocusEventInit.h',
             '<(blink_core_output_dir)/events/HashChangeEventInit.cpp',
             '<(blink_core_output_dir)/events/HashChangeEventInit.h',
@@ skipping 276 matching lines @@
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }