Force running GC on the worker thread before the unit test exits

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"
 #include "core/workers/WorkerLoaderProxy.h"
 #include "core/workers/WorkerObjectProxy.h"
 #include "core/workers/WorkerThreadStartupData.h"
 #include "modules/compositorworker/CompositorWorkerThread.h"
 #include "platform/NotImplemented.h"
 #include "platform/ThreadSafeFunctional.h"
+#include "platform/heap/Heap.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebWaitableEvent.h"
 #include <gtest/gtest.h>
+#include <v8.h>
 
 namespace blink {
 namespace {
 
 class TestCompositorWorkerThread : public CompositorWorkerThread {
 public:
     TestCompositorWorkerThread(WorkerLoaderProxyProvider* loaderProxyProvider, WorkerObjectProxy& objectProxy, double timeOrigin, WebWaitableEvent* startEvent)
         : CompositorWorkerThread(WorkerLoaderProxy::create(loaderProxyProvider), objectProxy, timeOrigin)
         , m_startEvent(startEvent)
     {
@@ skipping 11 matching lines @@
     void didStartRunLoop() override
     {
         m_startEvent->signal();
     }
     void terminateV8Execution() override
     {
         CompositorWorkerThread::terminateV8Execution();
         if (m_v8TerminationCallback)
             (*m_v8TerminationCallback)();
     }
+    void willDestroyIsolate() override
+    {
+        v8::Isolate::GetCurrent()->RequestGarbageCollectionForTesting(v8::Isolate::kFullGarbageCollection);
+        Heap::collectAllGarbage();
+        CompositorWorkerThread::willDestroyIsolate();
+    }
 
     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 195 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