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

third_party/WebKit/Source/web/CompositorMutatorImpl.cpp

Index: third_party/WebKit/Source/web/CompositorMutatorImpl.cpp
diff --git a/third_party/WebKit/Source/web/CompositorMutatorImpl.cpp b/third_party/WebKit/Source/web/CompositorMutatorImpl.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..27d9d0777fef3377dcd861f776d0c619a2a71661
--- /dev/null
+++ b/third_party/WebKit/Source/web/CompositorMutatorImpl.cpp
@@ -0,0 +1,56 @@
+// Copyright 2016 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 "web/CompositorMutatorImpl.h"
+
+#include "core/animation/CustomCompositorAnimationManager.h"
+#include "core/dom/CompositorProxy.h"
+#include "platform/TraceEvent.h"
+#include "platform/graphics/CompositorMutationsTarget.h"
+#include "platform/graphics/CompositorMutatorClient.h"
+#include "platform/heap/Handle.h"
+#include "web/CompositorProxyClientImpl.h"
+
+namespace blink {
+
+CompositorMutatorImpl::CompositorMutatorImpl()
+    : m_animationManager(adoptPtr(new CustomCompositorAnimationManager))
+    , m_client(nullptr)
+{
+}
+
+CompositorMutatorImpl* CompositorMutatorImpl::create()
+{
+    return new CompositorMutatorImpl();
+}
+
+bool CompositorMutatorImpl::mutate(double monotonicTimeNow)
+{
+    TRACE_EVENT0("compositor-worker", "CompositorMutatorImpl::mutate");
+    bool needToReinvoke = false;
+    // TODO(vollick): we should avoid executing the animation frame
+    // callbacks if none of the proxies in the global scope are affected by
+    // m_mutations.
+    for (CompositorProxyClientImpl* client : m_proxyClients) {
+        if (client->mutate(monotonicTimeNow))
+            needToReinvoke = true;
+    }
+
+    return needToReinvoke;
+}
+
+void CompositorMutatorImpl::registerProxyClient(CompositorProxyClientImpl* client)
+{
+    TRACE_EVENT0("compositor-worker", "CompositorMutatorImpl::registerClient");
+    m_proxyClients.add(client);
+    setNeedsMutate();
+}
+
+void CompositorMutatorImpl::setNeedsMutate()
+{
+    TRACE_EVENT0("compositor-worker", "CompositorMutatorImpl::setNeedsMutate");
+    m_client->setNeedsMutate();
+}
+
+} // namespace blink