Add UseCounters for ViewportAPI

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 93c32e8c16a849dad8397c059577c2ca848fd277..1d8cea0aaa7c1b877bcb956c1ebdeb07c8dc8cab 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -126,6 +126,8 @@
 #include "core/events/HashChangeEvent.h"
 #include "core/events/PageTransitionEvent.h"
 #include "core/events/ScopedEventQueue.h"
+#include "core/events/VisualViewportResizeEvent.h"
+#include "core/events/VisualViewportScrollEvent.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/DOMTimer.h"
 #include "core/frame/DOMVisualViewport.h"
@@ -3924,14 +3926,14 @@ void Document::enqueueMediaQueryChangeListeners(HeapVector<Member<MediaQueryList
 
 void Document::enqueueVisualViewportScrollEvent()
 {
-    Event* event = Event::create(EventTypeNames::scroll);
+    VisualViewportScrollEvent* event = VisualViewportScrollEvent::create();
     event->setTarget(domWindow()->visualViewport());
     ensureScriptedAnimationController().enqueuePerFrameEvent(event);
 }
 
 void Document::enqueueVisualViewportResizeEvent()
 {
-    Event* event = Event::create(EventTypeNames::resize);
+    VisualViewportResizeEvent* event = VisualViewportResizeEvent::create();
     event->setTarget(domWindow()->visualViewport());
     ensureScriptedAnimationController().enqueuePerFrameEvent(event);
 }