Make WebURLLoader capable of retaining received buffers.

content/child/ref_counted_shared_memory.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_REF_COUNTED_SHARED_MEMORY_H_
+#define CONTENT_REF_COUNTED_SHARED_MEMORY_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/shared_memory.h"
+
+namespace content {
+
+class RefCountedSharedMemory final
+    : public base::RefCounted<RefCountedSharedMemory> {
+ public:
+  RefCountedSharedMemory(base::SharedMemoryHandle handle, bool read_only);
+
+  base::SharedMemory& memory() { return memory_; }
+  const base::SharedMemory& memory() const { return memory_; }
+
+ private:
+  friend class base::RefCounted<RefCountedSharedMemory>;
+  ~RefCountedSharedMemory();
+
+  base::SharedMemory memory_;
+
+  DISALLOW_COPY_AND_ASSIGN(RefCountedSharedMemory);
+};
+
+}  // namespace content
+
+#endif  // #ifndef CONTENT_REF_COUNTED_SHARED_MEMORY_H_