Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/events/MouseEvent.cpp

Index: third_party/WebKit/Source/core/events/MouseEvent.cpp
diff --git a/third_party/WebKit/Source/core/events/MouseEvent.cpp b/third_party/WebKit/Source/core/events/MouseEvent.cpp
index 519e0df6a521a5757d61d0b6f76d26f8f2366ffa..5db92c82f7a719c752766550a553dd50b86bcddb 100644
--- a/third_party/WebKit/Source/core/events/MouseEvent.cpp
+++ b/third_party/WebKit/Source/core/events/MouseEvent.cpp
@@ -251,7 +251,7 @@ MouseEvent& MouseEventDispatchMediator::event() const
     return toMouseEvent(EventDispatchMediator::event());
 }
 
-bool MouseEventDispatchMediator::dispatchEvent(EventDispatcher& dispatcher) const
+WebInputEventResult MouseEventDispatchMediator::dispatchEvent(EventDispatcher& dispatcher) const
 {
     MouseEvent& mouseEvent = event();
     if (!mouseEvent.isTrusted()) {
@@ -260,21 +260,20 @@ bool MouseEventDispatchMediator::dispatchEvent(EventDispatcher& dispatcher) cons
     }
 
     if (isDisabledFormControl(&dispatcher.node()))
-        return false;
+        return WebInputEventResult::HandledSuppressed;
 
     if (mouseEvent.type().isEmpty())
-        return true; // Shouldn't happen.
+        return WebInputEventResult::NotHandled; // Shouldn't happen.
 
     ASSERT(!mouseEvent.target() || mouseEvent.target() != mouseEvent.relatedTarget());
 
     EventTarget* relatedTarget = mouseEvent.relatedTarget();
     mouseEvent.eventPath().adjustForRelatedTarget(dispatcher.node(), relatedTarget);
 
-    dispatcher.dispatch();
-    bool swallowEvent = mouseEvent.defaultHandled() || mouseEvent.defaultPrevented();
+    WebInputEventResult result = dispatcher.dispatch();
 
     if (mouseEvent.type() != EventTypeNames::click || mouseEvent.detail() != 2)
-        return !swallowEvent;
+        return result;
 
     // Special case: If it's a double click event, we also send the dblclick event. This is not part
     // of the DOM specs, but is used for compatibility with the ondblclick="" attribute. This is treated
@@ -288,10 +287,10 @@ bool MouseEventDispatchMediator::dispatchEvent(EventDispatcher& dispatcher) cons
     doubleClickEvent->setTrusted(mouseEvent.isTrusted());
     if (mouseEvent.defaultHandled())
         doubleClickEvent->setDefaultHandled();
-    EventDispatcher::dispatchEvent(dispatcher.node(), MouseEventDispatchMediator::create(doubleClickEvent));
-    if (doubleClickEvent->defaultHandled() || doubleClickEvent->defaultPrevented())
-        return false;
-    return !swallowEvent;
+    WebInputEventResult doubleClickEventResult = EventDispatcher::dispatchEvent(dispatcher.node(), MouseEventDispatchMediator::create(doubleClickEvent));
+    if (result != WebInputEventResult::NotHandled)
+        return result;
+    return doubleClickEventResult;
 }
 
 } // namespace blink