Move all components/offline_pages/ files into component/offline_pages/core

components/offline_pages/background/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 COMPONENTS_OFFLINE_PAGES_BACKGROUND_OFFLINER_H_
-#define COMPONENTS_OFFLINE_PAGES_BACKGROUND_OFFLINER_H_
-
-#include <string>
-
-#include "base/callback.h"
-
-namespace offline_pages {
-
-class SavePageRequest;
-
-// Interface of a class responsible for constructing an offline page given
-// a request with a URL.
-class Offliner {
- public:
-  // Status of processing an offline page request.
-  // WARNING: You must update histograms.xml to match any changes made to
-  // this enum (ie, OfflinePagesBackgroundOfflinerRequestStatus histogram enum).
-  // Also update related switch code in RequestCoordinatorEventLogger.
-  enum RequestStatus {
-    // No status determined/reported yet. Interim status, not sent in callback.
-    UNKNOWN = 0,
-    // Page loaded but not (yet) saved. Interim status, not sent in callback.
-    LOADED = 1,
-    // Offline page snapshot saved.
-    SAVED = 2,
-    // RequestCoordinator canceled request.
-    REQUEST_COORDINATOR_CANCELED = 3,
-    // Prerendering was canceled.
-    PRERENDERING_CANCELED = 4,
-    // Prerendering failed to load page.
-    PRERENDERING_FAILED = 5,
-    // Failed to save loaded page.
-    SAVE_FAILED = 6,
-    // Foreground transition canceled request.
-    FOREGROUND_CANCELED = 7,
-    // RequestCoordinator canceled request attempt per time limit.
-    REQUEST_COORDINATOR_TIMED_OUT = 8,
-    // The loader did not accept/start the request.
-    PRERENDERING_NOT_STARTED = 9,
-    // Prerendering failed with hard error so should not retry the request.
-    PRERENDERING_FAILED_NO_RETRY = 10,
-    // NOTE: insert new values above this line and update histogram enum too.
-    STATUS_COUNT
-  };
-
-  // Reports the completion status of a request.
-  // TODO(dougarnett): consider passing back a request id instead of request.
-  typedef base::Callback<void(const SavePageRequest&, RequestStatus)>
-      CompletionCallback;
-
-  Offliner() {}
-  virtual ~Offliner() {}
-
-  // Processes |request| to load and save an offline page.
-  // Returns whether the request was accepted or not. |callback| is guaranteed
-  // to be called if the request was accepted and |Cancel()| is not called.
-  virtual bool LoadAndSave(
-      const SavePageRequest& request,
-      const CompletionCallback& callback) = 0;
-
-  // Clears the currently processing request, if any, and skips running its
-  // CompletionCallback.
-  virtual void Cancel() = 0;
-
-  // TODO(dougarnett): add policy support methods.
-};
-
-}  // namespace offline_pages
-
-#endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_OFFLINER_H_