Enable resource prefetch from the browser process.

chrome/renderer/prefetch_helper.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 CHROME_RENDERER_PREFETCH_HELPER_H_
+#define CHROME_RENDERER_PREFETCH_HELPER_H_
+
+#include "content/public/renderer/render_frame_observer.h"
+#include "url/gurl.h"
+
+namespace prefetch {
+
+// Helper class iniitiate prefetches on behalf of a RenderFrame.

[jam, 2014/06/13 16:44:37]

nit: spelling

[tburkard, 2014/06/13 18:35:46]

Done.

+class PrefetchHelper : public content::RenderFrameObserver {
+ public:
+  explicit PrefetchHelper(content::RenderFrame* render_frame);
+  virtual ~PrefetchHelper();
+
+ private:
+  class PrefetchManager;
+
+  // RenderViewObserver implementation
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  void OnPrefetch(const GURL& url);
+
+  // A class keeping track of prefetches issued from the browser.
+  scoped_ptr<PrefetchManager> prefetch_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrefetchHelper);
+};
+
+}  // namespace prefetch
+
+#endif  // CHROME_RENDERER_PREFETCH_HELPER_H_