Bookkeep the pointer event listeners added to page

third_party/WebKit/Source/core/input/PointerEventManager.cpp

Index: third_party/WebKit/Source/core/input/PointerEventManager.cpp
diff --git a/third_party/WebKit/Source/core/input/PointerEventManager.cpp b/third_party/WebKit/Source/core/input/PointerEventManager.cpp
index 5fa4ebd155681c1366870b4e749c3a9fcfc4cce4..2a2c776babdd4e1848a40cdbf7cb69305496cff6 100644
--- a/third_party/WebKit/Source/core/input/PointerEventManager.cpp
+++ b/third_party/WebKit/Source/core/input/PointerEventManager.cpp
@@ -8,6 +8,7 @@
 #include "core/dom/UserGestureIndicator.h"
 #include "core/dom/shadow/FlatTreeTraversal.h"
 #include "core/events/MouseEvent.h"
+#include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/LocalFrameView.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLCanvasElement.h"
@@ -28,6 +29,9 @@ namespace {
 size_t ToPointerTypeIndex(WebPointerProperties::PointerType t) {
   return static_cast<size_t>(t);
 }
+bool HasPointerEventListener(const EventHandlerRegistry& registry) {
+  return registry.HasEventHandlers(EventHandlerRegistry::kPointerEvent);
+}
 
 Vector<std::pair<WebTouchPoint, TimeTicks>> GetCoalescedPoints(
     const Vector<WebTouchEvent>& coalesced_events,
@@ -159,8 +163,11 @@ WebInputEventResult PointerEventManager::DispatchPointerEvent(
     }
   }
 
-  if (!RuntimeEnabledFeatures::PointerEventEnabled())
+  if (!frame_ || !frame_->GetPage() ||
+      !HasPointerEventListener(frame_->GetPage()->GetEventHandlerRegistry()) ||
+      !RuntimeEnabledFeatures::PointerEventEnabled())
     return WebInputEventResult::kNotHandled;
+
   if (!check_for_listener || target->HasEventListeners(event_type)) {
     UseCounter::Count(frame_, UseCounter::kPointerEventDispatch);
     if (event_type == EventTypeNames::pointerdown)