compositor-worker: Introduce CompositorWorker.

Source/modules/compositorworker/CompositorWorker.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/CompositorWorker.h"
+
+#include "bindings/core/v8/ExceptionState.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/workers/WorkerClients.h"
+#include "modules/EventTargetModules.h"
+#include "modules/compositorworker/CompositorWorkerMessagingProxy.h"
+#include "wtf/MainThread.h"
+
+namespace blink {
+
+inline CompositorWorker::CompositorWorker(ExecutionContext* context)
+    : Worker(context)
+{
+}
+
+PassRefPtrWillBeRawPtr<CompositorWorker> CompositorWorker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
+{
+    ASSERT(isMainThread());
+    Document* document = toDocument(context);
+    if (!document->page()) {
+        exceptionState.throwDOMException(InvalidAccessError, "The context provided is invalid.");
+        return nullptr;
+    }
+    RefPtrWillBeRawPtr<CompositorWorker> worker = adoptRefWillBeNoop(new CompositorWorker(context));
+    if (worker->initialize(context, url, exceptionState))
+        return worker.release();
+    return nullptr;
+}
+
+CompositorWorker::~CompositorWorker()
+{
+    ASSERT(isMainThread());
+}
+
+const AtomicString& CompositorWorker::interfaceName() const
+{
+    return EventTargetNames::CompositorWorker;
+}
+
+WorkerGlobalScopeProxy* CompositorWorker::createWorkerGlobalScopeProxy(ExecutionContext* worker)
+{
+    ASSERT(executionContext()->isDocument());
+    OwnPtrWillBeRawPtr<WorkerClients> workerClients = WorkerClients::create();
+    return new CompositorWorkerMessagingProxy(this, workerClients.release());
+}
+
+} // namespace blink