[WIP] Add SpeechSynthesisErrorevent

Source/modules/speech/SpeechSynthesisErrorEvent.h

Index: Source/modules/speech/SpeechSynthesisErrorEvent.h
diff --git a/Source/modules/speech/SpeechSynthesisErrorEvent.h b/Source/modules/speech/SpeechSynthesisErrorEvent.h
new file mode 100644
index 0000000000000000000000000000000000000000..e0c143bacb1aee9cd03837b543398bac1c0d0dd5
--- /dev/null
+++ b/Source/modules/speech/SpeechSynthesisErrorEvent.h
@@ -0,0 +1,51 @@
+
+#ifndef SpeechSynthesisErrorEvent_h
+#define SpeechSynthesisErrorEvent_h
+
+#include "modules/EventModules.h"
+
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class SpeechSynthesisErrorEvent final : public Event  {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    enum ErrorCode {
+        ErrorCodeNone = 0,
+        ErrorCodeCanceled = 1,
+        ErrorCodeInterrupted = 2,
+        ErrorCodeAudioBusy = 3,
+        ErrorCodeAudioHardware = 4,
+        ErrorCodeNetwork = 5,
+        ErrorCodeSynthesisUnavailable = 6,
+        ErrorCodeSynthesisFailed = 7,
+        ErrorCodeLanguageUnavailable = 8,
+        ErrorCodeVoiceUnavailable = 9,
+        ErrorCodeTextTooLong = 10,
+        ErrorCodeInvalidArgument = 11,
+    };
+
+    static PassRefPtrWillBeRawPtr<SpeechSynthesisErrorEvent> create();
+    static PassRefPtrWillBeRawPtr<SpeechSynthesisErrorEvent> create(ErrorCode);
+
+    const String& error() { return m_error; }
+
+    virtual const AtomicString& interfaceName() const override;
+
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        Event::trace(visitor);
+    }
+
+
+private:
+    SpeechSynthesisErrorEvent(const String&);
+    SpeechSynthesisErrorEvent(const AtomicString&);
+
+    String m_error;
+};
+
+} // namespace blink
+
+#endif // SpeechSynthesisErrorEvent_h