Add an API to Pause and Resume background offlining requests.

components/offline_pages/background/request_coordinator.h

Index: components/offline_pages/background/request_coordinator.h
diff --git a/components/offline_pages/background/request_coordinator.h b/components/offline_pages/background/request_coordinator.h
index 5c6c03ba07193c4a779da7d6ea1d0ead94cf177e..3e52021e3597ca352a12cc6d2fdacad9c25b6db8 100644
--- a/components/offline_pages/background/request_coordinator.h
+++ b/components/offline_pages/background/request_coordinator.h
@@ -55,6 +55,14 @@ class RequestCoordinator : public KeyedService {
   // TODO(petewil): Add code to cancel an in-progress pre-render.
   void RemoveRequests(const std::vector<ClientId>& client_ids);
 
+  // Pause a list of requests by |request_id|.  This will change the state
+  // in the request queue so the request cannot be started.
+  // TODO(petewil): Add code to cancel an in-progress pre-render.
+  void PauseRequests(const std::vector<int64_t>& request_ids);
+
+  // Resume a list of previously paused requests, making them available.
+  void ResumeRequests(const std::vector<int64_t>& request_ids);
+
   // Callback that receives the response for GetQueuedRequests.  Client must
   // copy the result right away, it goes out of scope at the end of the
   // callback.