Split a portion of BufferedResourceLoader into a separate class ActiveLoader.

webkit/media/active_loader.h

+// Copyright (c) 2011 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 WEBKIT_MEDIA_ACTIVE_LOADER_H_
+#define WEBKIT_MEDIA_ACTIVE_LOADER_H_
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace WebKit {
+class WebURLLoader;
+}
+
+namespace webkit_media {
+
+class BufferedResourceLoader;
+
+// Wraps an active WebURLLoader with some additional state and maintains a
+// reference to its parent.
+//
+// Handles deferring and cancellation of loaders upon deletion.
+class ActiveLoader {
+ public:
+  // Creates an ActiveLoader with a reference to its parent. The initial state
+  // assumes that the loader has started loading and has not been deferred.
+  //
+  // ActiveLoader takes ownership of |loader|.
+  ActiveLoader(const scoped_refptr<BufferedResourceLoader>& parent,
+               WebKit::WebURLLoader* loader);
+  ~ActiveLoader();
+
+  // Starts or stops deferring the resource load.
+  void SetDeferred(bool deferred);
+
+  bool deferred() { return deferred_; }
+
+ private:
+  friend class BufferedDataSourceTest;
+
+  scoped_refptr<BufferedResourceLoader> parent_;
+  scoped_ptr<WebKit::WebURLLoader> loader_;
+  bool deferred_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ActiveLoader);
+};
+
+}  // namespace webkit_media
+
+#endif  // WEBKIT_MEDIA_ACTIVE_LOADER_H_