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

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

 /*
  * Copyright (C) 2008, 2009, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 103 matching lines @@
         InspectorInstrumentation::willReleaseScriptContext(frame, m_scriptState.get());
     }
 
     m_document.clear();
 
     if (behavior == DetachGlobal)
         m_scriptState->detachGlobalObject();
 
     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.
     V8GCForContextDispose::instance().notifyContextDisposed(m_frame->isMainFrame());
 }
 
 void WindowProxy::clearForClose()
 {
     if (!isContextInitialized())
         return;
@@ skipping 187 matching lines @@
             extensionNames.append(extension->name());
         }
     }
     v8::ExtensionConfiguration extensionConfiguration(extensionNames.size(), extensionNames.data());
 
     v8::Local<v8::Context> context = v8::Context::New(m_isolate, &extensionConfiguration, globalTemplate, m_global.newLocal(m_isolate));
     if (context.IsEmpty())
         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())
         histogramName = "WebCore.WindowProxy.createContext.IsolatedWorld";
     Platform::current()->histogramCustomCounts(histogramName, contextCreationDurationInMilliseconds, 0, 10000, 50);
 }
 
 static v8::Local<v8::Object> toInnerGlobalObject(v8::Local<v8::Context> context)
 {
     return v8::Local<v8::Object>::Cast(context->Global()->GetPrototype());
@@ skipping 217 matching lines @@
 }
 
 void WindowProxy::updateSecurityOrigin(SecurityOrigin* origin)
 {
     if (!isContextInitialized())
         return;
     setSecurityToken(origin);
 }
 
 } // namespace blink