Make WebTaskRunner ThreadSafeRefCounted

third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.cpp

 // Copyright 2016 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 "platform/graphics/gpu/SharedGpuContext.h"
 
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "platform/CrossThreadFunctional.h"
 #include "platform/WaitableEvent.h"
 #include "platform/WebTaskRunner.h"
@@ skipping 39 matching lines @@
     m_contextProvider = m_contextProviderFactory();
   } else if (isMainThread()) {
     m_contextProvider =
         WTF::wrapUnique(blink::Platform::current()
                             ->createSharedOffscreenGraphicsContext3DProvider());
   } else {
     // This synchronous round-trip to the main thread is the reason why
     // SharedGpuContext encasulates the context provider: so we only have to do
     // this once per thread.
     WaitableEvent waitableEvent;
-    WebTaskRunner* taskRunner =
+    RefPtr<WebTaskRunner> taskRunner =
         Platform::current()->mainThread()->getWebTaskRunner();
     taskRunner->postTask(
         BLINK_FROM_HERE,
         crossThreadBind(&SharedGpuContext::createContextProviderOnMainThread,
                         crossThreadUnretained(this),
                         crossThreadUnretained(&waitableEvent)));
     waitableEvent.wait();
     if (m_contextProvider && !m_contextProvider->bindToCurrentThread())
       m_contextProvider = nullptr;
   }
@@ skipping 50 matching lines @@
 
 bool SharedGpuContext::isValidWithoutRestoring() {
   SharedGpuContext* thisPtr = getInstanceForCurrentThread();
   if (!thisPtr->m_contextProvider)
     return false;
   return thisPtr->m_contextProvider->contextGL()->GetGraphicsResetStatusKHR() ==
          GL_NO_ERROR;
 }
 
 }  // blink