Import TestRunner library into chromium.

content/public/test/layout_tests/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.
+
+/*
+ * Copyright (C) 2010 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WebTask_h
+#define WebTask_h
+
+#include <vector>
+
+#include "content/public/test/layout_tests/WebTestCommon.h"
+
+namespace WebTestRunner {
+
+class WebTaskList;
+
+// WebTask represents a task which can run by WebTestDelegate::postTask() or
+// WebTestDelegate::postDelayedTask().
+class WEBTESTRUNNER_EXPORT 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 WEBTESTRUNNER_EXPORT 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