[InputEvent] Add InputEvent with basic interface behind a flag

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

Index: third_party/WebKit/Source/core/dom/Node.cpp
diff --git a/third_party/WebKit/Source/core/dom/Node.cpp b/third_party/WebKit/Source/core/dom/Node.cpp
index 4601c1891bdd06e43776a94d037d99cab6265032..5821e596567d96ed1541f3b6091c23a0a772d378 100644
--- a/third_party/WebKit/Source/core/dom/Node.cpp
+++ b/third_party/WebKit/Source/core/dom/Node.cpp
@@ -66,6 +66,7 @@
 #include "core/events/EventDispatcher.h"
 #include "core/events/EventListener.h"
 #include "core/events/GestureEvent.h"
+#include "core/events/InputEvent.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/events/MouseEvent.h"
 #include "core/events/MutationEvent.h"
@@ -2084,7 +2085,13 @@ void Node::dispatchSimulatedClick(Event* underlyingEvent, SimulatedClickMouseEve
 
 void Node::dispatchInputEvent()
 {
-    dispatchScopedEvent(Event::createBubble(EventTypeNames::input));
+    if (RuntimeEnabledFeatures::inputEventEnabled()) {
+        InputEventInit eventInitDict;
+        eventInitDict.setBubbles(true);
+        dispatchScopedEvent(InputEvent::create(EventTypeNames::input, eventInitDict));
+    } else {
+        dispatchScopedEvent(Event::createBubble(EventTypeNames::input));
+    }
 }
 
 void Node::defaultEventHandler(Event* event)