Cancel prerendering when a request is paused or removed.

components/offline_pages/background/request_coordinator.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_REQUEST_COORDINATOR_H_
 #define COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_COORDINATOR_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 120 matching lines @@
     return last_offlining_status_;
   }
 
   bool is_busy() {
     return is_busy_;
   }
 
   // Tracks whether the last offlining attempt got canceled.  This is reset by
   // the next StartProcessing() call.
   bool is_canceled() {
-    return is_canceled_;
+    return is_stopped_;
   }
 
   OfflineEventLogger* GetLogger() {
     return &event_logger_;
   }
 
  private:
   // Receives the results of a get from the request queue, and turns that into
   // SavePageRequest objects for the caller of GetQueuedRequests.
   void GetQueuedRequestsCallback(const GetRequestsCallback& callback,
@@ skipping 15 matching lines @@
   void RemoveRequestsCallback(
       const RequestQueue::UpdateMultipleRequestResults& results,
       const std::vector<SavePageRequest>& requests);
 
   // Callback from the request picker when it has chosen our next request.
   void RequestPicked(const SavePageRequest& request);
 
   // Callback from the request picker when no more requests are in the queue.
   void RequestQueueEmpty();
 
+  // Cancels an in progress pre-rendering, and updates state appropriately.
+  void StopPrerendering();
+
   void SendRequestToOffliner(const SavePageRequest& request);
 
   // Called by the offliner when an offlining request is completed. (and by
   // tests).
   void OfflinerDoneCallback(const SavePageRequest& request,
                             Offliner::RequestStatus status);
 
   void TryNextRequest();
 
+  // If there is an active request in the list, cancel that request.
+  bool CancelActiveRequestIfItMatches(const std::vector<int64_t>& request_ids);
+
   // Returns the appropriate offliner to use, getting a new one from the factory
   // if needed.
   void GetOffliner();
 
   void SetOfflinerTimeoutForTest(const base::TimeDelta& timeout) {
     offliner_timeout_ = timeout;
   }
 
   void SetDeviceConditionsForTest(DeviceConditions& current_conditions) {
     current_conditions_.reset(new DeviceConditions(current_conditions));
   }
 
   friend class RequestCoordinatorTest;
 
   // The offliner can only handle one request at a time - if the offliner is
   // busy, prevent other requests.  This flag marks whether the offliner is in
   // use.
   bool is_busy_;
   // True if the current request has been canceled.
-  bool is_canceled_;
+  bool is_stopped_;
   // Unowned pointer to the current offliner, if any.
   Offliner* offliner_;
   base::Time operation_start_time_;
   // The observers.
   base::ObserverList<Observer> observers_;
   // Last known conditions for network, battery
   std::unique_ptr<DeviceConditions> current_conditions_;
   // RequestCoordinator takes over ownership of the policy
   std::unique_ptr<OfflinerPolicy> policy_;
   // OfflinerFactory.  Used to create offline pages. Owned.
@@ skipping 18 matching lines @@
   base::TimeDelta offliner_timeout_;
   // Allows us to pass a weak pointer to callbacks.
   base::WeakPtrFactory<RequestCoordinator> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RequestCoordinator);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_COORDINATOR_H_