Add a way to send the resource percentage signal to the RC.

components/offline_pages/core/background/request_coordinator.cc

Index: components/offline_pages/core/background/request_coordinator.cc
diff --git a/components/offline_pages/core/background/request_coordinator.cc b/components/offline_pages/core/background/request_coordinator.cc
index 78cbccf1ffb625e08f1e9716245789f687330f6b..4a97bad700ca43d6986a17d91a5f5651cd7b5bb9 100644
--- a/components/offline_pages/core/background/request_coordinator.cc
+++ b/components/offline_pages/core/background/request_coordinator.cc
@@ -1077,6 +1077,14 @@ const Scheduler::TriggerConditions RequestCoordinator::GetTriggerConditions(
       policy_->UnmeteredNetworkRequired(user_requested));
 }
 
+void RequestCoordinator::ObserveResourceTracking(const ResourceDataType type,
+                                                 int64_t started_count,
+                                                 int64_t completed_count) {
+  if (state_ != RequestCoordinatorState::OFFLINING)
+    return;
+  offliner_->ObserveResourceTracking(type, started_count, completed_count);
+}
+
 void RequestCoordinator::AddObserver(Observer* observer) {
   DCHECK(observer);
   observers_.AddObserver(observer);