compositor-worker: Initialize CW machinery plumbing to compositor and fire CW rAF callbacks.

third_party/WebKit/Source/modules/compositorworker/CompositorWorkerGlobalScope.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/CompositorWorkerGlobalScope.h"
 
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "core/workers/WorkerObjectProxy.h"
 #include "core/workers/WorkerThreadStartupData.h"
 #include "modules/EventTargetModules.h"
 #include "modules/compositorworker/CompositorWorkerThread.h"
 
 namespace blink {
 
 CompositorWorkerGlobalScope* CompositorWorkerGlobalScope::create(CompositorWorkerThread* thread, PassOwnPtr<WorkerThreadStartupData> startupData, double timeOrigin)
 {
     // Note: startupData is finalized on return. After the relevant parts has been
     // passed along to the created 'context'.
     CompositorWorkerGlobalScope* context = new CompositorWorkerGlobalScope(startupData->m_scriptURL, startupData->m_userAgent, thread, timeOrigin, startupData->m_starterOriginPrivilegeData.release(), startupData->m_workerClients.release());
     context->applyContentSecurityPolicyFromVector(*startupData->m_contentSecurityPolicyHeaders);
     context->setAddressSpace(startupData->m_addressSpace);
     return context;
 }
 
 CompositorWorkerGlobalScope::CompositorWorkerGlobalScope(const KURL& url, const String& userAgent, CompositorWorkerThread* thread, double timeOrigin, PassOwnPtr<SecurityOrigin::PrivilegeData> starterOriginPrivilegeData, WorkerClients* workerClients)
     : WorkerGlobalScope(url, userAgent, thread, timeOrigin, starterOriginPrivilegeData, workerClients)
+    , m_executingAnimationFrameCallbacks(false)
     , m_callbackCollection(this)
+    , m_client(CompositorProxyClient::from(clients()))
 {
+    m_client->setGlobalScope(this);
+    ThreadState::current()->registerPreFinalizer(this);
+}
+
+void CompositorWorkerGlobalScope::dispose()
+{
+    m_client->setGlobalScope(nullptr);
 }
 
 CompositorWorkerGlobalScope::~CompositorWorkerGlobalScope()
 {
 }
 
 DEFINE_TRACE(CompositorWorkerGlobalScope)
 {
     visitor->trace(m_callbackCollection);
+    visitor->trace(m_client);
     WorkerGlobalScope::trace(visitor);
 }
 
 const AtomicString& CompositorWorkerGlobalScope::interfaceName() const
 {
     return EventTargetNames::CompositorWorkerGlobalScope;
 }
 
 void CompositorWorkerGlobalScope::postMessage(ExecutionContext* executionContext, PassRefPtr<SerializedScriptValue> message, const MessagePortArray& ports, ExceptionState& exceptionState)
 {
     // Disentangle the port in preparation for sending it to the remote context.
     OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(executionContext, ports, exceptionState);
     if (exceptionState.hadException())
         return;
     thread()->workerObjectProxy().postMessageToWorkerObject(message, channels.release());
 }
 
 int CompositorWorkerGlobalScope::requestAnimationFrame(FrameRequestCallback* callback)
 {
+    const bool shouldSignal = !m_executingAnimationFrameCallbacks && m_callbackCollection.isEmpty();
+    if (shouldSignal)
+        m_client->requestMutation();
     return m_callbackCollection.registerCallback(callback);
 }
 
 void CompositorWorkerGlobalScope::cancelAnimationFrame(int id)
 {
     m_callbackCollection.cancelCallback(id);
 }
 
-void CompositorWorkerGlobalScope::executeAnimationFrameCallbacks(double highResTimeNow)
+bool CompositorWorkerGlobalScope::executeAnimationFrameCallbacks(double highResTimeNow)
 {
+    TemporaryChange<bool> temporaryChange(m_executingAnimationFrameCallbacks, true);
     m_callbackCollection.executeCallbacks(highResTimeNow, highResTimeNow);
+    return !m_callbackCollection.isEmpty();
 }
 
 CompositorWorkerThread* CompositorWorkerGlobalScope::thread() const
 {
     return static_cast<CompositorWorkerThread*>(WorkerGlobalScope::thread());
 }
 
 } // namespace blink