Prepare CompositorWorker for per thread heap

third_party/WebKit/Source/modules/compositorworker/CompositorWorkerThreadTest.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 "modules/compositorworker/CompositorWorkerThread.h"
 
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "bindings/core/v8/SourceLocation.h"
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/WorkerOrWorkletScriptController.h"
@@ skipping 51 matching lines @@
     Persistent<ExecutionContext> m_executionContext;
 };
 
 class TestCompositorProxyClient
     : public GarbageCollected<TestCompositorProxyClient>
     , public CompositorProxyClient {
     USING_GARBAGE_COLLECTED_MIXIN(TestCompositorProxyClient);
 public:
     TestCompositorProxyClient() {}
 
+    void dispose() override {}
     void setGlobalScope(WorkerGlobalScope*) override {}
     void requestAnimationFrame() override {}
     void registerCompositorProxy(CompositorProxy*) override {}
     void unregisterCompositorProxy(CompositorProxy*) override {}
 };
 
 class CompositorWorkerTestPlatform : public TestingPlatformSupport {
 public:
     CompositorWorkerTestPlatform()
         : m_thread(wrapUnique(m_oldPlatform->createThread("Compositor")))
@@ skipping 155 matching lines @@
     v8::Isolate* secondIsolate = secondWorker->isolate();
     ASSERT_TRUE(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