DevTools: introduce perf monitor actions w/ time budget for violations that are event handlers.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 99 matching lines @@
 }
 
 void reportBlockedEvent(ExecutionContext* context,
                         const Event* event,
                         RegisteredEventListener* registeredListener,
                         double delayedSeconds) {
   if (registeredListener->listener()->type() !=
       EventListener::JSEventListenerType)
     return;
 
-  V8AbstractEventListener* v8Listener =
-      V8AbstractEventListener::cast(registeredListener->listener());
-  v8::HandleScope handles(v8Listener->isolate());
-  v8::Local<v8::Context> v8Context = toV8Context(context, v8Listener->world());
-  if (v8Context.IsEmpty())
-    return;
-  v8::Context::Scope contextScope(v8Context);
-  v8::Local<v8::Object> handler = v8Listener->getListenerObject(context);
-
   String messageText = String::format(
       "Handling of '%s' input event was delayed for %ld ms due to main thread "
       "being busy. "
       "Consider marking event handler as 'passive' to make the page more "
       "responsive.",
       event->type().getString().utf8().data(), lround(delayedSeconds * 1000));
 
-  v8::Local<v8::Function> function =
-      eventListenerEffectiveFunction(v8Listener->isolate(), handler);
-  std::unique_ptr<SourceLocation> location =
-      SourceLocation::fromFunction(function);
-
   PerformanceMonitor::reportGenericViolation(
       context, PerformanceMonitor::kBlockedEvent, messageText, delayedSeconds,
-      location.get());
+      getFunctionLocation(context, registeredListener->listener()).get());
   registeredListener->setBlockedEventWarningEmitted();
 }
 
 }  // namespace
 
 EventTargetData::EventTargetData() {}
 
 EventTargetData::~EventTargetData() {}
 
 DEFINE_TRACE(EventTargetData) {
@@ skipping 537 matching lines @@
     // If stopImmediatePropagation has been called, we just break out
     // immediately, without handling any more events on this target.
     if (event->immediatePropagationStopped())
       break;
 
     event->setHandlingPassive(eventPassiveMode(registeredListener));
     bool passiveForced = registeredListener.passiveForcedForDocumentTarget();
 
     InspectorInstrumentation::NativeBreakpoint nativeBreakpoint(context, this,
                                                                 event);
+    PerformanceMonitor::HandlerCall handlerCall(context, listener);
 
     // To match Mozilla, the AT_TARGET phase fires both capturing and bubbling
     // event listeners, even though that violates some versions of the DOM spec.
     listener->handleEvent(context, event);
     firedListener = true;
 
     // If we're about to report this event listener as blocking, make sure it
     // wasn't removed while handling the event.
     if (shouldReportBlockedEvent && i > 0 &&
         entry[i - 1].listener() == listener && !entry[i - 1].passive() &&
@@ skipping 53 matching lines @@
   // they have one less listener to invoke.
   if (d->firingEventIterators) {
     for (size_t i = 0; i < d->firingEventIterators->size(); ++i) {
       d->firingEventIterators->at(i).iterator = 0;
       d->firingEventIterators->at(i).end = 0;
     }
   }
 }
 
 }  // namespace blink