Adjust leak detector expectations for IntersectionObserver

content/shell/renderer/layout_test/leak_detector.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/shell/renderer/layout_test/leak_detector.h"
 
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/values.h"
 #include "content/shell/renderer/layout_test/blink_test_runner.h"
@@ skipping 13 matching lines @@
 const int kInitialNumberOfLiveAudioNodes = 0;
 const int kInitialNumberOfLiveDocuments = 1;
 const int kInitialNumberOfLiveNodes = 4;
 const int kInitialNumberOfLiveLayoutObjects = 3;
 const int kInitialNumberOfLiveResources = 0;
 const int kInitialNumberOfScriptPromises = 0;
 const int kInitialNumberOfLiveFrames = 1;
 const int kInitialNumberOfWorkerGlobalScopes = 0;
 
 // In the initial state, there are two ActiveDOMObjects (FontFaceSet created by
-// HTMLDocument and SuspendableTimer created by DocumentLoader).
-const int kInitialNumberOfLiveActiveDOMObject = 2;
+// HTMLDocument and SuspendableTimer created by DocumentLoader). A third one
+// (IntersectionObserverController) may be created if the root document
+// registers an intersection observer.
+const int kInitialNumberOfLiveActiveDOMObject = 3;
 
 // This includes not only about:blank's context but also ScriptRegexp (e.g.
 // created by isValidEmailAddress in EmailInputType.cpp). The leak detector
 // always creates the latter to stabilize the number of V8PerContextData
 // objects.
 const int kInitialNumberOfV8PerContextData = 2;
 
 LeakDetector::LeakDetector(BlinkTestRunner* test_runner)
     : test_runner_(test_runner),
       web_leak_detector_(blink::WebLeakDetector::create(this)) {
@@ skipping 98 matching lines @@
     base::JSONWriter::Write(detail, &detail_str);
     report.detail = detail_str;
     report.leaked = true;
   }
 
   previous_result_ = result;
   test_runner_->ReportLeakDetectionResult(report);
 }
 
 }  // namespace content