[cc] Rename all cc/ filenames to Chromium style

cc/scoped_thread_proxy.h

-// Copyright 2012 The Chromium Authors. All rights reserved.
+// Copyright 2011 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 CCScopedThreadProxy_h
+#define CCScopedThreadProxy_h
+
+#include "CCThreadTask.h"
+#include "base/threading/platform_thread.h"
+#include <wtf/OwnPtr.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/ThreadSafeRefCounted.h>
+
+namespace cc {
+
+// This class is a proxy used to post tasks to an target thread from any other thread. The proxy may be shut down at
+// any point from the target thread after which no more tasks posted to the proxy will run. In other words, all
+// tasks posted via a proxy are scoped to the lifecycle of the proxy. Use this when posting tasks to an object that
+// might die with tasks in flight.
+//
+// The proxy must be created and shut down from the target thread, tasks may be posted from any thread.
+//
+// Implementation note: Unlike ScopedRunnableMethodFactory in Chromium, pending tasks are not cancelled by actually
+// destroying the proxy. Instead each pending task holds a reference to the proxy to avoid maintaining an explicit
+// list of outstanding tasks.
+class CCScopedThreadProxy : public ThreadSafeRefCounted<CCScopedThreadProxy> {
+public:
+    static PassRefPtr<CCScopedThreadProxy> create(CCThread* targetThread)
+    {
+        ASSERT(base::PlatformThread::CurrentId() == targetThread->threadID());
+        return adoptRef(new CCScopedThreadProxy(targetThread));
+    }
+
+    ~CCScopedThreadProxy();
+
+    // Can be called from any thread. Posts a task to the target thread that runs unless
+    // shutdown() is called before it runs.
+    void postTask(PassOwnPtr<CCThread::Task> task)
+    {
+        ref();
+        m_targetThread->postTask(createCCThreadTask(this, &CCScopedThreadProxy::runTaskIfNotShutdown, task));
+    }
+
+    void shutdown()
+    {
+        ASSERT(base::PlatformThread::CurrentId() == m_targetThread->threadID());
+        ASSERT(!m_shutdown);
+        m_shutdown = true;
+    }
+
+private:
+    explicit CCScopedThreadProxy(CCThread* targetThread);
+
+    void runTaskIfNotShutdown(PassOwnPtr<CCThread::Task> popTask)
+    {
+        OwnPtr<CCThread::Task> task = popTask;
+        // If our shutdown flag is set, it's possible that m_targetThread has already been destroyed so don't
+        // touch it.
+        if (m_shutdown) {
+            deref();
+            return;
+        }
+        ASSERT(base::PlatformThread::CurrentId() == m_targetThread->threadID());
+        task->performTask();
+        deref();
+    }
+
+    CCThread* m_targetThread;
+    bool m_shutdown; // Only accessed on the target thread
+};
+
+}
+
+#endif