Adds shells of classes (PrerenderingOffliner and PrerenderingLoader) to intergrate from Background …

chrome/browser/android/offline_pages/prerendering_offliner.h

+// Copyright 2016 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_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_H_
+#define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_H_
+
+#include "chrome/browser/android/offline_pages/prerendering_loader.h"
+#include "components/offline_pages/background/offliner.h"
+#include "components/offline_pages/offline_page_model.h"
+
+class Profile;
+
+namespace content {
+class WebContents;
+}  // namespace content
+
+namespace offline_pages {
+
+// An Offliner implementation that uses the PrerenderManager for client-side
+// rendering. This handles loading a page and then saving it to the offline
+// page model.
+class PrerenderingOffliner : public Offliner {

[Pete Williamson, 2016/04/27 23:58:28]

How is this different from the PrerenderingLoader?  I'd like the class comments
to explain that a bit better (either here or in the other class or both)

[dougarnett, 2016/04/28 00:18:03]

Please see if updated comments are better and good enuf.

[Pete Williamson, 2016/04/28 00:28:45]

Acknowledged.

+ public:
+  // TODO(dougarnett): consider not locking to profile (pass in request).
+  PrerenderingOffliner(Profile* profile, OfflinePageModel* offline_page_model);
+  ~PrerenderingOffliner() override;
+
+  bool LoadAndSave(
+      const SavePageRequest& request,
+      const CompletionCallback& callback) override;
+
+  void Cancel();
+
+ private:
+  std::unique_ptr<PrerenderingLoader> loader_;
+  // Not owned.
+  OfflinePageModel* offline_page_model_;
+};
+
+}  // namespace offline_pages
+
+#endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_H_