Communicate whether passive event listeners exist to cc.

third_party/WebKit/Source/core/frame/EventHandlerRegistry.h

Index: third_party/WebKit/Source/core/frame/EventHandlerRegistry.h
diff --git a/third_party/WebKit/Source/core/frame/EventHandlerRegistry.h b/third_party/WebKit/Source/core/frame/EventHandlerRegistry.h
index 18de8230a4bb127791f41048d30506c161f221d0..0a8a49864d97167243fbfab2aa1039326c1276ed 100644
--- a/third_party/WebKit/Source/core/frame/EventHandlerRegistry.h
+++ b/third_party/WebKit/Source/core/frame/EventHandlerRegistry.h
@@ -12,6 +12,7 @@
 namespace blink {
 
 class Document;
+class EventListenerOptions;
 class EventTarget;
 
 typedef HashCountedSet<RawPtrWillBeUntracedMember<EventTarget>> EventTargetSet;
@@ -30,7 +31,9 @@ public:
     enum EventHandlerClass {
         ScrollEvent,
         WheelEvent,

[Rick Byers, 2016/02/02 21:44:45]

nit rename this to WheelEventBlocking, and TouchEvent to TouchEventBlocking to
make it clear that Passive is not a subset of the total, and to ensure we're
actually updating the expectations of all the consumers (in many cases it's no
longer sufficient to just ask if there are any 'WheelEvent' listeners).

+        WheelEventPassive,
         TouchEvent,
+        TouchEventPassive,
 #if ENABLE(ASSERT)
         // Additional event categories for verifying handler tracking logic.
         EventsForTesting,
@@ -45,9 +48,9 @@ public:
     const EventTargetSet* eventHandlerTargets(EventHandlerClass) const;
 
     // Registration and management of event handlers attached to EventTargets.
-    void didAddEventHandler(EventTarget&, const AtomicString& eventType);
+    void didAddEventHandler(EventTarget&, const AtomicString& eventType, const EventListenerOptions&);
     void didAddEventHandler(EventTarget&, EventHandlerClass);
-    void didRemoveEventHandler(EventTarget&, const AtomicString& eventType);
+    void didRemoveEventHandler(EventTarget&, const AtomicString& eventType, const EventListenerOptions&);
     void didRemoveEventHandler(EventTarget&, EventHandlerClass);
     void didRemoveAllEventHandlers(EventTarget&);
 
@@ -72,7 +75,7 @@ private:
     };
 
     // Returns true if |eventType| belongs to a class this registry tracks.
-    static bool eventTypeToClass(const AtomicString& eventType, EventHandlerClass* result);
+    static bool eventTypeToClass(const AtomicString& eventType, const EventListenerOptions&, EventHandlerClass* result);
 
     // Returns true if the operation actually added a new target or completely
     // removed an existing one.
@@ -91,7 +94,7 @@ private:
 
     // Record a change operation to a given event handler class and notify any
     // parent registry and other clients accordingly.
-    void updateEventHandlerOfType(ChangeOperation, const AtomicString& eventType, EventTarget*);
+    void updateEventHandlerOfType(ChangeOperation, const AtomicString& eventType, const EventListenerOptions&, EventTarget*);
 
     void updateEventHandlerInternal(ChangeOperation, EventHandlerClass, EventTarget*);