Add constructors for WebAudio events

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

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 #include "modules/webaudio/AudioProcessingEvent.h"
+#include "modules/webaudio/AudioProcessingEventInit.h"
 
 namespace blink {
 
 AudioProcessingEvent* AudioProcessingEvent::create() {
   return new AudioProcessingEvent;
 }
 
 AudioProcessingEvent* AudioProcessingEvent::create(AudioBuffer* inputBuffer,
                                                    AudioBuffer* outputBuffer,
                                                    double playbackTime) {
   return new AudioProcessingEvent(inputBuffer, outputBuffer, playbackTime);
 }
 
+AudioProcessingEvent* AudioProcessingEvent::create(
+    const AtomicString& type,
+    const AudioProcessingEventInit& initializer) {
+  return new AudioProcessingEvent(type, initializer);
+}
+
 AudioProcessingEvent::AudioProcessingEvent() {}
 
 AudioProcessingEvent::AudioProcessingEvent(AudioBuffer* inputBuffer,
                                            AudioBuffer* outputBuffer,
                                            double playbackTime)
     : Event(EventTypeNames::audioprocess, true, false),
       m_inputBuffer(inputBuffer),
       m_outputBuffer(outputBuffer),
       m_playbackTime(playbackTime) {}
 
+AudioProcessingEvent::AudioProcessingEvent(
+    const AtomicString& type,
+    const AudioProcessingEventInit& initializer)
+    : Event(type, initializer) {
+  m_inputBuffer = initializer.inputBuffer();
+  m_outputBuffer = initializer.outputBuffer();
+  m_playbackTime = initializer.playbackTime();
+}
+
 AudioProcessingEvent::~AudioProcessingEvent() {}
 
 const AtomicString& AudioProcessingEvent::interfaceName() const {
   return EventNames::AudioProcessingEvent;
 }
 
 DEFINE_TRACE(AudioProcessingEvent) {
   visitor->trace(m_inputBuffer);
   visitor->trace(m_outputBuffer);
   Event::trace(visitor);
 }
 
 }  // namespace blink