Introduce WebTaskRunner Patch 1/5

public/platform/WebTaskRunner.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 WebTaskRunner_h
+#define WebTaskRunner_h
+
+#include "WebCommon.h"
+
+namespace blink {
+
+class WebTraceLocation;
+
+// The blink representation of a chromium SingleThreadTaskRunner.
+class BLINK_PLATFORM_EXPORT WebTaskRunner {
+public:
+    virtual ~WebTaskRunner() {}
+
+    class BLINK_PLATFORM_EXPORT Task {
+    public:
+        virtual ~Task() { }
+        virtual void run() = 0;
+    };
+
+    // Schedule a task to be run on the the associated WebThread.
+    // Takes ownership of |Task|. Can be called from any thread.
+    virtual void postTask(const WebTraceLocation&, Task*) {}
+
+    // Schedule a task to be run after |delayMs| on the the associated WebThread.
+    // Takes ownership of |Task|. Can be called from any thread.
+    // TODO(alexclarke): Remove this when possible.
+    virtual void postDelayedTask(const WebTraceLocation&, Task*, long long delayMs) {}
+
+    // Schedule a task to be run after |delayMs| on the the associated WebThread.
+    // Takes ownership of |Task|. Can be called from any thread.
+    virtual void postDelayedTask(const WebTraceLocation&, Task*, double delayMs) {}
+
+    // TODO(alexclarke): Add helpers for posting bound functions as tasks.
+};
+
+} // namespace blink
+
+#endif // WebTaskRunner_h