Add shared GlobalEventHandlers IDL

Source/core/core.gypi

 {
     'variables': {
         'core_idl_files': [
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSKeyframeRule.idl',
@@ skipping 47 matching lines @@
             'dom/DOMStringMap.idl',
             'dom/DOMTokenList.idl',
             'dom/DataTransferItem.idl',
             'dom/DataTransferItemList.idl',
             'dom/Document.idl',
             'dom/DocumentFragment.idl',
             'dom/DocumentFullscreen.idl',
             'dom/DocumentType.idl',
             'dom/Element.idl',
             'dom/Entity.idl',
+            'dom/GlobalEventHandlers.idl',
             'dom/MessageChannel.idl',
             'dom/MessagePort.idl',
             'dom/MutationObserver.idl',
             'dom/MutationRecord.idl',
             'dom/NamedNodeMap.idl',
             'dom/Node.idl',
             'dom/NodeFilter.idl',
             'dom/NodeIterator.idl',
             'dom/NodeList.idl',
             'dom/Notation.idl',
@@ skipping 1769 matching lines @@
             'dom/ElementRareData.h',
             'dom/ElementTraversal.h',
             'dom/Entity.h',
             'dom/ExecutionContext.cpp',
             'dom/ExecutionContext.h',
             'dom/ExecutionContextClient.h',
             'dom/ExecutionContextTask.cpp',
             'dom/ExecutionContextTask.h',
             'dom/FullscreenElementStack.cpp',
             'dom/FullscreenElementStack.h',
+            'dom/GlobalEventHandlers.h',
             'dom/IconURL.cpp',
             'dom/IconURL.h',
             'dom/IdTargetObserver.cpp',
             'dom/IdTargetObserver.h',
             'dom/IdTargetObserverRegistry.cpp',
             'dom/IdTargetObserverRegistry.h',
             'dom/IgnoreDestructiveWriteCountIncrementer.h',
             'dom/LiveNodeList.cpp',
             'dom/LiveNodeList.h',
             'dom/MessageChannel.cpp',
@@ skipping 1807 matching lines @@
                 'bison_exe': 'bison',
                 # We specify a preprocess so it happens locally and won't get
                 # distributed to goma.
                 # FIXME: /usr/bin/gcc won't exist on OSX forever. We want to
                 # use /usr/bin/clang once we require Xcode 4.x.
                 'preprocessor': '--preprocessor "/usr/bin/gcc -E -P -x c++"'
               }],
          ],
     }
 }