Add an API to Pause and Resume background offlining requests.

components/offline_pages/background/request_queue_store.h

Index: components/offline_pages/background/request_queue_store.h
diff --git a/components/offline_pages/background/request_queue_store.h b/components/offline_pages/background/request_queue_store.h
index d4a9d3527a3a16e716d87e4e3b0f7435e1a38540..890e08e4e771004030f6259c37ee33a46278fa98 100644
--- a/components/offline_pages/background/request_queue_store.h
+++ b/components/offline_pages/background/request_queue_store.h
@@ -61,6 +61,16 @@ class RequestQueueStore {
   virtual void RemoveRequestsByClientId(const std::vector<ClientId>& client_ids,
                                         const RemoveCallback& callback) = 0;
 
+  // Asynchronously pauses requests from the store using their request id.
+  virtual void PauseRequests(const std::vector<int64_t>& request_ids,
+                             const UpdateCallback& callback) = 0;
+
+  // Asynchronously resumes requests from the store using their request id.
+  // This will set the state from PAUSED back to AVAILABLE, so the request can
+  // be picked up on the next scheduled run.
+  virtual void ResumeRequests(const std::vector<int64_t>& request_ids,
+                              const UpdateCallback& callback) = 0;
+
   // Resets the store.
   virtual void Reset(const ResetCallback& callback) = 0;
 };