Convert performance monitor to the subscription model.

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

Index: third_party/WebKit/Source/core/events/EventTarget.cpp
diff --git a/third_party/WebKit/Source/core/events/EventTarget.cpp b/third_party/WebKit/Source/core/events/EventTarget.cpp
index 99562b50dbc1064632c9c4b1335e3a1f0570fef2..b7bd6325e42488f7b6765afba9eb48a0c41be74f 100644
--- a/third_party/WebKit/Source/core/events/EventTarget.cpp
+++ b/third_party/WebKit/Source/core/events/EventTarget.cpp
@@ -59,8 +59,6 @@ using namespace WTF;
 namespace blink {
 namespace {
 
-static const double kBlockedWarningThresholdMillis = 100.0;
-
 enum PassiveForcedListenerResultType {
   PreventDefaultNotCalled,
   DocumentLevelTouchPreventDefaultCalled,
@@ -96,15 +94,14 @@ bool isScrollBlockingEvent(const AtomicString& eventType) {
          eventType == EventTypeNames::wheel;
 }
 
-double blockedEventsWarningThreshold(ExecutionContext* context, Event* event) {
+double blockedEventsWarningThreshold(ExecutionContext* context,
+                                     const Event* event) {
   if (!event->cancelable())
     return 0.0;
   if (!isScrollBlockingEvent(event->type()))
     return 0.0;
-
-  return PerformanceMonitor::enabled(context)
-             ? kBlockedWarningThresholdMillis / 1000
-             : 0;
+  return PerformanceMonitor::threshold(context,
+                                       PerformanceMonitor::kBlockedEvent);
 }
 
 void reportBlockedEvent(ExecutionContext* context,
@@ -135,8 +132,10 @@ void reportBlockedEvent(ExecutionContext* context,
       eventListenerEffectiveFunction(v8Listener->isolate(), handler);
   std::unique_ptr<SourceLocation> location =
       SourceLocation::fromFunction(function);
-  PerformanceMonitor::logViolation(WarningMessageLevel, context, messageText,
-                                   std::move(location));
+
+  PerformanceMonitor::reportGenericViolation(
+      context, PerformanceMonitor::kBlockedEvent, messageText, delayedSeconds,
+      std::move(location));
   registeredListener->setBlockedEventWarningEmitted();
 }