Add an API to Pause and Resume background offlining requests.

components/offline_pages/background/request_coordinator.cc

Index: components/offline_pages/background/request_coordinator.cc
diff --git a/components/offline_pages/background/request_coordinator.cc b/components/offline_pages/background/request_coordinator.cc
index cde6cede1f0810c79d13b57acbe799e983b330d1..8f257a0490b68315e661c656d14a4f3a4166fcb1 100644
--- a/components/offline_pages/background/request_coordinator.cc
+++ b/components/offline_pages/background/request_coordinator.cc
@@ -124,6 +124,23 @@ void RequestCoordinator::RemoveRequests(
                              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) {