Fix WorkerThreadTest.GcOccursWhileIdle.

Source/core/workers/WorkerThreadTest.cpp

 // Copyright 2015 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 "config.h"
 #include "core/workers/WorkerThread.h"
 
 #include "core/inspector/ConsoleMessage.h"
 #include "core/workers/WorkerReportingProxy.h"
 #include "core/workers/WorkerThreadStartupData.h"
@@ skipping 214 matching lines @@
 {
     OwnPtr<WebWaitableEvent> gcDone = adoptPtr(Platform::current()->createWaitableEvent());
 
     ON_CALL(*m_workerThread, doIdleGc(_)).WillByDefault(Invoke(
         [&gcDone](double)
         {
             gcDone->signal();
             return false;
         }));
 
-    EXPECT_CALL(*m_workerThread, doIdleGc(_)).Times(1);
+    EXPECT_CALL(*m_workerThread, doIdleGc(_)).Times(testing::AtLeast(1));
 
     startAndWaitForInit();
     postWakeUpTask(500ul);
 
     gcDone->wait();
     m_workerThread->terminateAndWait();
 };
 
 class RepeatingTask : public WebThread::Task {
 public:
@@ skipping 41 matching lines @@
 
     completion->wait();
 
     // Make sure doIdleGc has not been called by this stage.
     Mock::VerifyAndClearExpectations(m_workerThread.get());
 
     m_workerThread->terminateAndWait();
 }
 
 } // namespace blink