[WIP] Add SpeechSynthesisErrorevent

Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 154 matching lines @@
       'speech/SpeechGrammar.idl',
       'speech/SpeechGrammarList.idl',
       'speech/SpeechRecognition.idl',
       'speech/SpeechRecognitionAlternative.idl',
       'speech/SpeechRecognitionError.idl',
       'speech/SpeechRecognitionEvent.idl',
       'speech/SpeechRecognitionResult.idl',
       'speech/SpeechRecognitionResultList.idl',
       'speech/SpeechSynthesis.idl',
       'speech/SpeechSynthesisEvent.idl',
+      'speech/SpeechSynthesisErrorEvent.idl',
       'speech/SpeechSynthesisUtterance.idl',
       'speech/SpeechSynthesisVoice.idl',
       'storage/Storage.idl',
       'storage/StorageEvent.idl',
       'vr/HMDVRDevice.idl',
       'vr/PositionSensorVRDevice.idl',
       'vr/VRDevice.idl',
       'vr/VREyeParameters.idl',
       'vr/VRFieldOfView.idl',
       'vr/VRPositionState.idl',
@@ skipping 904 matching lines @@
       'speech/SpeechRecognitionEvent.cpp',
       'speech/SpeechRecognitionEvent.h',
       'speech/SpeechRecognitionResult.cpp',
       'speech/SpeechRecognitionResult.h',
       'speech/SpeechRecognitionResultList.cpp',
       'speech/SpeechRecognitionResultList.h',
       'speech/SpeechSynthesis.cpp',
       'speech/SpeechSynthesis.h',
       'speech/SpeechSynthesisEvent.cpp',
       'speech/SpeechSynthesisEvent.h',
+      'speech/SpeechSynthesisErrorEvent.cpp',
+      'speech/SpeechSynthesisErrorEvent.h',
       'speech/SpeechSynthesisUtterance.cpp',
       'speech/SpeechSynthesisUtterance.h',
       'speech/SpeechSynthesisVoice.cpp',
       'speech/SpeechSynthesisVoice.h',
       'storage/DOMWindowStorage.cpp',
       'storage/DOMWindowStorage.h',
       'storage/DOMWindowStorageController.cpp',
       'storage/DOMWindowStorageController.h',
       'storage/InspectorDOMStorageAgent.cpp',
       'storage/InspectorDOMStorageAgent.h',
@@ skipping 254 matching lines @@
       'indexeddb/IDBKeyPathTest.cpp',
       'indexeddb/IDBRequestTest.cpp',
       'indexeddb/IDBTransactionTest.cpp',
       'serviceworkers/CacheTest.cpp',
       'serviceworkers/ServiceWorkerContainerTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }