Implement DeviceMotionEvent constructor.

third_party/WebKit/Source/modules/device_orientation/DeviceMotionEvent.cpp

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 #include "modules/device_orientation/DeviceMotionEvent.h"
 
 #include "modules/device_orientation/DeviceAcceleration.h"
 #include "modules/device_orientation/DeviceMotionData.h"
+#include "modules/device_orientation/DeviceMotionEventInit.h"
 #include "modules/device_orientation/DeviceRotationRate.h"
 
 namespace blink {
 
 DeviceMotionEvent::~DeviceMotionEvent() {}
 
 DeviceMotionEvent::DeviceMotionEvent()
     : m_deviceMotionData(DeviceMotionData::create()) {}
 
 DeviceMotionEvent::DeviceMotionEvent(const AtomicString& eventType,
+                                     const DeviceMotionEventInit& initializer)
+    : Event(eventType, initializer),
+      m_deviceMotionData(DeviceMotionData::create(initializer)) {}
+
+DeviceMotionEvent::DeviceMotionEvent(const AtomicString& eventType,
                                      DeviceMotionData* deviceMotionData)
     : Event(eventType, false, false),  // Can't bubble, not cancelable
       m_deviceMotionData(deviceMotionData) {}
 
 void DeviceMotionEvent::initDeviceMotionEvent(
     const AtomicString& type,
     bool bubbles,
     bool cancelable,
     DeviceMotionData* deviceMotionData) {
   if (isBeingDispatched())
@@ skipping 54 matching lines @@
 
 DEFINE_TRACE(DeviceMotionEvent) {
   visitor->trace(m_deviceMotionData);
   visitor->trace(m_acceleration);
   visitor->trace(m_accelerationIncludingGravity);
   visitor->trace(m_rotationRate);
   Event::trace(visitor);
 }
 
 }  // namespace blink