Fix safepoint entering when waiting for a debugger task.

third_party/WebKit/Source/core/workers/WorkerThread.cpp

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 509 matching lines @@
 
 WorkerThread::TaskQueueResult WorkerThread::runDebuggerTask(WaitMode waitMode)
 {
     ASSERT(isCurrentThread());
     TaskQueueResult result;
     double absoluteTime = DebuggerTaskQueue::infiniteTime();
     OwnPtr<WebTaskRunner::Task> task;
     {
         if (waitMode == DontWaitForTask)
             absoluteTime = 0.0;
-        SafePointScope safePointScope(BlinkGC::NoHeapPointersOnStack);
+        SafePointScope safePointScope(BlinkGC::HeapPointersOnStack);
         task = m_debuggerTaskQueue->waitWithTimeout(result, absoluteTime);
     }
 
     if (result == TaskReceived) {
         InspectorInstrumentation::willProcessTask(workerGlobalScope());
         task->run();
         InspectorInstrumentation::didProcessTask(workerGlobalScope());
     }
 
     return result;
 }
 
 void WorkerThread::willRunDebuggerTasks()
 {
     InspectorInstrumentation::willEnterNestedRunLoop(m_workerGlobalScope.get());
 }
 
 void WorkerThread::didRunDebuggerTasks()
 {
     InspectorInstrumentation::didLeaveNestedRunLoop(m_workerGlobalScope.get());
 }
 
 void WorkerThread::setWorkerInspectorController(WorkerInspectorController* workerInspectorController)
 {
     MutexLocker locker(m_workerInspectorControllerMutex);
     m_workerInspectorController = workerInspectorController;
 }
 
 } // namespace blink