Add an API to Pause and Resume background offlining requests.

components/offline_pages/background/request_coordinator.cc

 // 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.
 
 #include "components/offline_pages/background/request_coordinator.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 94 matching lines @@
   callback.Run(requests);
 }
 
 void RequestCoordinator::RemoveRequests(
     const std::vector<int64_t>& request_ids) {
   queue_->RemoveRequests(request_ids,
                          base::Bind(&RequestCoordinator::RemoveRequestsCallback,
                                     weak_ptr_factory_.GetWeakPtr()));
 }
 
+void RequestCoordinator::PauseRequests(
+    const std::vector<int64_t>& request_ids) {
+  queue_->ChangeRequestsState(
+      request_ids, SavePageRequest::RequestState::PAUSED,
+      base::Bind(&RequestCoordinator::UpdateMultipleRequestCallback,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void RequestCoordinator::ResumeRequests(
+    const std::vector<int64_t>& request_ids) {
+  queue_->ChangeRequestsState(
+      request_ids, SavePageRequest::RequestState::AVAILABLE,
+      base::Bind(&RequestCoordinator::UpdateMultipleRequestCallback,
+                 weak_ptr_factory_.GetWeakPtr()));
+  // TODO: Should we also schedule a task, in case there is not one scheduled?
+}
+
 void RequestCoordinator::AddRequestResultCallback(
     RequestQueue::AddRequestResult result,
     const SavePageRequest& request) {
 
   // Inform the scheduler that we have an outstanding task..
   scheduler_->Schedule(GetTriggerConditionsForUserRequest());
 }
 
 // Called in response to updating a request in the request queue.
 void RequestCoordinator::UpdateRequestCallback(
@@ skipping 229 matching lines @@
   return trigger_conditions;
 }
 
 void RequestCoordinator::GetOffliner() {
   if (!offliner_) {
     offliner_ = factory_->GetOffliner(policy_.get());
   }
 }
 
 }  // namespace offline_pages