WIP - compositor worker mega patch.

third_party/WebKit/Source/web/CompositorProxyClientImpl.h

+// 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.
+
+#ifndef CompositorProxyClientImpl_h
+#define CompositorProxyClientImpl_h
+
+#include "core/dom/CompositorProxyClient.h"
+
+#include "public/platform/WebMutation.h"
+#include "wtf/Noncopyable.h"
+
+#include <map>
+#include <set>
+#include <vector>
+
+namespace blink {
+
+class CompositorProxy;
+class CompositorWorkerGlobalScope;
+class WebCompositorMutableStateProvider;
+class WebMutatorImpl;
+class WorkerGlobalScope;
+
+class CompositorProxyClientImpl : public CompositorProxyClient {
+    WTF_MAKE_NONCOPYABLE(CompositorProxyClientImpl);
+
+public:
+    explicit CompositorProxyClientImpl(WebMutatorImpl*);
+    ~CompositorProxyClientImpl() override;
+
+    bool mutate(double timeNow, WebCompositorMutableStateProvider*);
+
+    // CompositorProxyClient:
+    void registerCompositorProxy(CompositorProxy*) override;
+    void unregisterCompositorProxy(CompositorProxy*) override;
+    void requestSync(CompositorProxy*) override;
+
+    void setGlobalScope(WorkerGlobalScope*) override;
+    void requestMutation() override;
+
+private:
+    void willStartCompositorFrameCallbacks(WebCompositorMutableStateProvider*);
+    bool executeAnimationFrameCallbacks(double time);
+
+    WebMutatorImpl* m_mutator;
+
+    // TODO(vollick): These could use wtf containers, but this would force
+    // us to oilpan-ify WebMutatorImpl and, transitively, a lot more stuff.
+    // Particularly problematic in that stuff is the rAF task which must be
+    // created outside of a safe point and whose ownership is passed between
+    // threads. The code as it stands is correct and the raw pointers here
+    // have the right semantics. Namely, they should not be traced (i.e.,
+    // they do not hide memory that should be visible to oilpan), they do
+    // not retain the CompositorProxies (their lifetime is managed by
+    // oilpan), they will continue to be valid during the lifetime of the
+    // CompositorProxies (since oilpan is not a compacting GC), and we do
+    // not want oilpan to take action to clear out these collections or
+    // update weak pointers when the objects are destroyed (we handle that
+    // ourselves via disconnection). In short, we do not need oilpan to do
+    // management for us because we're handling it ourself and we need to
+    // handle it ourself because of our unique multi-threaded requirements.
+    typedef std::vector<CompositorProxy*> ProxyVector;
+    typedef std::map<uint64_t, ProxyVector> ProxyMap;
+    ProxyMap m_proxies;
+    HashSet<uint64_t> m_requiresSync;
+
+    CompositorWorkerGlobalScope* m_globalScope;
+    bool m_executingAnimationFrameCallbacks;
+    bool m_requestedAnimationFrameCallbacks;
+};
+
+} // namespace blink
+
+#endif // CompositorProxyClientImpl_h