Add constructors for WebAudio events

third_party/WebKit/Source/modules/webaudio/AudioProcessingEvent.h

Index: third_party/WebKit/Source/modules/webaudio/AudioProcessingEvent.h
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioProcessingEvent.h b/third_party/WebKit/Source/modules/webaudio/AudioProcessingEvent.h
index a85b8de0fbae1b77a3e9ea8abad1767953effa69..d8407ec8f5d3fde4d66b0ab34551b7eabc226aff 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioProcessingEvent.h
+++ b/third_party/WebKit/Source/modules/webaudio/AudioProcessingEvent.h
@@ -28,12 +28,14 @@
 
 #include "modules/EventModules.h"
 #include "modules/webaudio/AudioBuffer.h"
+#include "modules/webaudio/AudioProcessingEventInit.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class AudioBuffer;
+class AudioProcessingEventInit;
 
 class AudioProcessingEvent final : public Event {
   DEFINE_WRAPPERTYPEINFO();
@@ -44,6 +46,9 @@ class AudioProcessingEvent final : public Event {
                                       AudioBuffer* outputBuffer,
                                       double playbackTime);
 
+  static AudioProcessingEvent* create(const AtomicString& type,
+                                      const AudioProcessingEventInit&);
+
   ~AudioProcessingEvent() override;
 
   AudioBuffer* inputBuffer() { return m_inputBuffer.get(); }
@@ -59,6 +64,8 @@ class AudioProcessingEvent final : public Event {
   AudioProcessingEvent(AudioBuffer* inputBuffer,
                        AudioBuffer* outputBuffer,
                        double playbackTime);
+  AudioProcessingEvent(const AtomicString& type,
+                       const AudioProcessingEventInit&);
 
   Member<AudioBuffer> m_inputBuffer;
   Member<AudioBuffer> m_outputBuffer;