Introduce WorkerThread::willShutdown()

Source/modules/compositorworker/CompositorWorkerManagerTest.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 "modules/compositorworker/CompositorWorkerManager.h"
 
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/testing/DummyPageHolder.h"
@@ skipping 33 matching lines @@
     void didStartRunLoop() override
     {
         m_startEvent->signal();
     }
     void terminateV8Execution() override
     {
         CompositorWorkerThread::terminateV8Execution();
         if (m_v8TerminationCallback)
             (*m_v8TerminationCallback)();
     }
-    void willDestroyIsolate() override
+    void willShutdown() override
     {
         v8::Isolate::GetCurrent()->RequestGarbageCollectionForTesting(v8::Isolate::kFullGarbageCollection);
         Heap::collectAllGarbage();
-        CompositorWorkerThread::willDestroyIsolate();
+        CompositorWorkerThread::willShutdown();
     }
 
     WebWaitableEvent* m_startEvent;
     OwnPtr<Function<void()>> m_v8TerminationCallback;
 };
 
 // A null WorkerObjectProxy, supplied when creating CompositorWorkerThreads.
 class TestCompositorWorkerObjectProxy : public WorkerObjectProxy {
 public:
     static PassOwnPtr<TestCompositorWorkerObjectProxy> create(ExecutionContext* context)
@@ skipping 196 matching lines @@
     v8::Isolate* secondIsolate = secondWorker->isolate();
     ASSERT(secondIsolate);
     EXPECT_EQ(firstIsolate, secondIsolate);
 
     // Verify that the isolate can run some scripts correctly in the second worker.
     checkWorkerCanExecuteScript(secondWorker.get());
     secondWorker->terminateAndWait();
 }
 
 } // namespace blink