Introduce a basic Blink Scheduler

public/platform/WebSchedulerProxy.h

Index: public/platform/WebSchedulerProxy.h
diff --git a/public/platform/WebSchedulerProxy.h b/public/platform/WebSchedulerProxy.h
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+++ b/public/platform/WebSchedulerProxy.h
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+// Copyright 2014 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 WebSchedulerProxy_h
+#define WebSchedulerProxy_h
+
+#include "WebThread.h"
+
+namespace WebCore {
+class Scheduler;
+}
+
+namespace blink {
+
+class WebSchedulerProxy {
+public:
+    BLINK_PLATFORM_EXPORT ~WebSchedulerProxy();
+
+    BLINK_PLATFORM_EXPORT static WebSchedulerProxy create();
+
+    // Schedule an input processing task to be run on the blink main thread.
+    // Takes ownership of |Task|. Can be called from any thread.
+    BLINK_PLATFORM_EXPORT void postInputTask(WebThread::Task*);
+
+    // Schedule a compositor task to run on the blink main thread. Takes
+    // ownership of |Task|. Can be called from any thread.
+    BLINK_PLATFORM_EXPORT void postCompositorTask(WebThread::Task*);
+
+private:
+    WebSchedulerProxy();
+
+    WebCore::Scheduler* m_scheduler;
+};
+
+} // namespace blink
+
+#endif // WebSchedulerProxy_h