Add WebScheduler implementation to HTMLViewer

mojo/services/html_viewer/webscheduler_impl.h

Index: mojo/services/html_viewer/webscheduler_impl.h
diff --git a/mojo/services/html_viewer/webscheduler_impl.h b/mojo/services/html_viewer/webscheduler_impl.h
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+// 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 MOJO_SERVICES_HTML_VIEWER_WEBSCHEDULER_IMPL_H_
+#define MOJO_SERVICES_HTML_VIEWER_WEBSCHEDULER_IMPL_H_
+
+#include "third_party/WebKit/public/platform/WebScheduler.h"
+#include "third_party/WebKit/public/platform/WebThread.h"
+#include "third_party/WebKit/public/platform/WebTraceLocation.h"
+
+namespace html_viewer {
+
+class WebSchedulerImpl : public blink::WebScheduler {
+ public:
+  explicit WebSchedulerImpl(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+  ~WebSchedulerImpl() override;
+
+ private:
+  // blink::WebScheduler overrides.
+  virtual void postIdleTask(const blink::WebTraceLocation& location,
+                    blink::WebScheduler::IdleTask* task);
+  virtual void postLoadingTask(const blink::WebTraceLocation& location,
+                       blink::WebThread::Task* task);
+  virtual void shutdown();
+
+  static void RunIdleTask(scoped_ptr<blink::WebScheduler::IdleTask> task);
+  static void RunTask(scoped_ptr<blink::WebThread::Task> task);
+
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebSchedulerImpl);
+};
+
+}  // namespace html_viewer
+
+#endif  // MOJO_SERVICES_HTML_VIEWER_WEBSCHEDULER_IMPL_H_