Adding WebThread and new BlinkPlatformImpl for utility thread.

content/utility/webthread_impl_for_utility_thread.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 CONTENT_UTILITY_WEBTHREAD_IMPL_FOR_UTILITY_THREAD_H_
+#define CONTENT_UTILITY_WEBTHREAD_IMPL_FOR_UTILITY_THREAD_H_
+
+#include "base/containers/scoped_ptr_hash_map.h"
+#include "components/scheduler/child/webthread_base.h"
+
+namespace content {
+
+class WebThreadImplForUtilityThread : public scheduler::WebThreadBase {
+ public:
+  explicit WebThreadImplForUtilityThread();

[Sami, 2015/05/11 17:08:02]

No need for explicit since there are no parameters.

[ssid, 2015/05/11 17:21:00]

Done.

+  virtual ~WebThreadImplForUtilityThread();

[Sami, 2015/05/11 17:08:02]

~WebThreadImplForUtilityThread() override;

[ssid, 2015/05/11 17:21:00]

Done.

+
+  // blink::WebThread implementation.
+  blink::WebScheduler* scheduler() const override;
+  blink::PlatformThreadId threadId() const override;
+
+  // WebThreadBase implementation.
+  base::SingleThreadTaskRunner* TaskRunner() const override;
+  scheduler::SingleThreadIdleTaskRunner* IdleTaskRunner() const override;
+
+ private:
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  blink::PlatformThreadId thread_id_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_UTILITY_WEBTHREAD_IMPL_FOR_UTILITY_THREAD_H_