Import TestRunner library into chromium.

content/shell/renderer/test_runner/WebTask.h

+// Copyright 2013 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 WebTask_h
+#define WebTask_h
+
+#include <vector>
+
+namespace WebTestRunner {
+
+class WebTaskList;
+
+// WebTask represents a task which can run by WebTestDelegate::postTask() or
+// WebTestDelegate::postDelayedTask().
+class WebTask {
+public:
+    explicit WebTask(WebTaskList*);
+    virtual ~WebTask();
+
+    // The main code of this task.
+    // An implementation of run() should return immediately if cancel() was called.
+    virtual void run() = 0;
+    virtual void cancel() = 0;
+
+protected:
+    WebTaskList* m_taskList;
+};
+
+class WebTaskList {
+public:
+    WebTaskList();
+    ~WebTaskList();
+    void registerTask(WebTask*);
+    void unregisterTask(WebTask*);
+    void revokeAll();
+
+private:
+    std::vector<WebTask*> m_tasks;
+};
+
+// A task containing an object pointer of class T. Derived classes should
+// override runIfValid() which in turn can safely invoke methods on the
+// m_object. The Class T must have "WebTaskList* taskList()".
+template<class T>
+class WebMethodTask : public WebTask {
+public:
+    explicit WebMethodTask(T* object)
+        : WebTask(object->taskList())
+        , m_object(object)
+    {
+    }
+
+    virtual ~WebMethodTask() { }
+
+    virtual void run()
+    {
+        if (m_object)
+            runIfValid();
+    }
+
+    virtual void cancel()
+    {
+        m_object = 0;
+        m_taskList->unregisterTask(this);
+        m_taskList = 0;
+    }
+
+    virtual void runIfValid() = 0;
+
+protected:
+    T* m_object;
+};
+
+}
+
+#endif // WebTask_h