Oilpan: We shouldn't trigger too many conservative GCs when detaching iframes

third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp

Index: third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
index bb9636af37b7d74ae186133ff694896c460ff612..a1c993c8a2ca6c3514fa7ec3cdbd116db5640022 100644
--- a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
@@ -121,6 +121,9 @@ void WindowProxy::disposeContext(GlobalDetachmentBehavior behavior)
 
     m_scriptState->disposePerContextData();
 
+    if (ThreadState::current())
+        ThreadState::current()->v8ContextDisposed();
+
     // It's likely that disposing the context has created a lot of
     // garbage. Notify V8 about this so it'll have a chance of cleaning
     // it up when idle.
@@ -328,6 +331,9 @@ void WindowProxy::createContext()
         return;
     m_scriptState = ScriptState::create(context, m_world);
 
+    if (ThreadState::current())
+        ThreadState::current()->v8ContextCreated();
+
     double contextCreationDurationInMilliseconds = (currentTime() - contextCreationStartInSeconds) * 1000;
     const char* histogramName = "WebCore.WindowProxy.createContext.MainWorld";
     if (!m_world->isMainWorld())