Split up leak detector into two stages for better leak reporting.

third_party/WebKit/Source/web/WebLeakDetector.cpp

Index: third_party/WebKit/Source/web/WebLeakDetector.cpp
diff --git a/third_party/WebKit/Source/web/WebLeakDetector.cpp b/third_party/WebKit/Source/web/WebLeakDetector.cpp
index e1ddecbab86bf329b6cd9c60d7956be2f3b50bd0..54c16242e9826b7459cf8f1f0f1d377faff17104 100644
--- a/third_party/WebKit/Source/web/WebLeakDetector.cpp
+++ b/third_party/WebKit/Source/web/WebLeakDetector.cpp
@@ -65,7 +65,8 @@ public:
 
     ~WebLeakDetectorImpl() override {}
 
-    void collectGarbageAndGetDOMCounts(WebLocalFrame*) override;
+    void prepareForLeakDetection(WebLocalFrame*) override;
+    void collectGarbageAndReport() override;
 
 private:
     void delayedGCAndReport(Timer<WebLeakDetectorImpl>*);
@@ -77,7 +78,7 @@ private:
     int m_numberOfGCNeeded;
 };
 
-void WebLeakDetectorImpl::collectGarbageAndGetDOMCounts(WebLocalFrame* frame)
+void WebLeakDetectorImpl::prepareForLeakDetection(WebLocalFrame* frame)
 {
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     v8::HandleScope handleScope(isolate);
@@ -100,10 +101,13 @@ void WebLeakDetectorImpl::collectGarbageAndGetDOMCounts(WebLocalFrame* frame)
 
     // FIXME: HTML5 Notification should be closed because notification affects the result of number of DOM objects.
 
-    V8GCController::collectAllGarbageForTesting(isolate);
-    // Note: Oilpan precise GC is scheduled at the end of the event loop.
-
     V8PerIsolateData::from(isolate)->clearScriptRegexpContext();
+}
+
+void WebLeakDetectorImpl::collectGarbageAndReport()
+{
+    V8GCController::collectAllGarbageForTesting(V8PerIsolateData::mainThreadIsolate());
+    // Note: Oilpan precise GC is scheduled at the end of the event loop.
 
     // Task queue may contain delayed object destruction tasks.
     // This method is called from navigation hook inside FrameLoader,