Remove WebKit::Platform dependencies from cc

cc/thread_impl.h

+// 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 CC_THREAD_IMPL_H_
+#define CC_THREAD_IMPL_H_
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop_proxy.h"
+#include "cc/thread.h"
+
+namespace cc {
+
+// Implements cc::Thread in terms of base::MessageLoopProxy.
+class ThreadImpl : public Thread {
+public:
+    // Creates a ThreadImpl wrapping the current thread.
+    static scoped_ptr<cc::Thread> createForCurrentThread();
+
+    // Creates a Thread wrapping a non-current thread.
+    static scoped_ptr<cc::Thread> createForDifferentThread(scoped_refptr<base::MessageLoopProxy> thread);
+
+    virtual ~ThreadImpl();
+
+    // cc::Thread implementation
+    virtual void postTask(base::Closure cb) OVERRIDE;
+    virtual void postDelayedTask(base::Closure cb, long long delayMs) OVERRIDE;
+    virtual bool belongsToCurrentThread() const OVERRIDE;
+
+private:
+    explicit ThreadImpl(scoped_refptr<base::MessageLoopProxy> thread);
+
+    scoped_refptr<base::MessageLoopProxy> m_thread;
+};
+
+} // namespace cc
+
+#endif  // CC_THREAD_IMPL_H_