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

third_party/WebKit/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp

Index: third_party/WebKit/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp
diff --git a/third_party/WebKit/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp b/third_party/WebKit/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp
index 9389cb2ee960d0cc95ef6bf6ccbfa40146865ad8..c2a1df98ec807faf25e3a54ffd29087b0e98df0e 100644
--- a/third_party/WebKit/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp
+++ b/third_party/WebKit/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp
@@ -24,8 +24,17 @@ CompositorWorkerGlobalScope* CompositorWorkerGlobalScope::create(CompositorWorke
 
 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()
@@ -35,6 +44,7 @@ CompositorWorkerGlobalScope::~CompositorWorkerGlobalScope()
 DEFINE_TRACE(CompositorWorkerGlobalScope)
 {
     visitor->trace(m_callbackCollection);
+    visitor->trace(m_client);
     WorkerGlobalScope::trace(visitor);
 }
 
@@ -54,6 +64,9 @@ void CompositorWorkerGlobalScope::postMessage(ExecutionContext* executionContext
 
 int CompositorWorkerGlobalScope::requestAnimationFrame(FrameRequestCallback* callback)
 {
+    const bool shouldSignal = !m_executingAnimationFrameCallbacks && m_callbackCollection.isEmpty();
+    if (shouldSignal)
+        m_client->requestMutation();
     return m_callbackCollection.registerCallback(callback);
 }
 
@@ -62,9 +75,11 @@ 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