Measure EventSource usage in Document and Workers.

third_party/WebKit/Source/core/page/EventSource.cpp

 /*
  * Copyright (C) 2009, 2012 Ericsson AB. All rights reserved.
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011, Code Aurora Forum. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 25 matching lines @@
 #include "bindings/core/v8/ScriptController.h"
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "bindings/core/v8/SerializedScriptValueFactory.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/events/Event.h"
 #include "core/events/MessageEvent.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/UseCounter.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/loader/ThreadableLoader.h"
 #include "core/page/EventSourceInit.h"
 #include "platform/HTTPNames.h"
 #include "platform/network/ResourceError.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/network/ResourceResponse.h"
 #include "platform/weborigin/SecurityOrigin.h"
@@ skipping 12 matching lines @@
     , m_currentURL(url)
     , m_withCredentials(eventSourceInit.withCredentials())
     , m_state(CONNECTING)
     , m_connectTimer(this, &EventSource::connectTimerFired)
     , m_reconnectDelay(defaultReconnectDelay)
 {
 }
 
 EventSource* EventSource::create(ExecutionContext* context, const String& url, const EventSourceInit& eventSourceInit, ExceptionState& exceptionState)
 {
+    if (context->isDocument())
+        UseCounter::count(toDocument(context), UseCounter::EventSourceDocument);
+    else
+        UseCounter::count(context, UseCounter::EventSourceWorker);
+
     if (url.isEmpty()) {
         exceptionState.throwDOMException(SyntaxError, "Cannot open an EventSource to an empty URL.");
         return nullptr;
     }
 
     KURL fullURL = context->completeURL(url);
     if (!fullURL.isValid()) {
         exceptionState.throwDOMException(SyntaxError, "Cannot open an EventSource to '" + url + "'. The URL is invalid.");
         return nullptr;
     }
@@ skipping 265 matching lines @@
 
 DEFINE_TRACE(EventSource)
 {
     visitor->trace(m_parser);
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
     EventSourceParser::Client::trace(visitor);
 }
 
 } // namespace blink