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

components/offline_pages/core/background/request_coordinator.h

Index: components/offline_pages/core/background/request_coordinator.h
diff --git a/components/offline_pages/core/background/request_coordinator.h b/components/offline_pages/core/background/request_coordinator.h
index 05a1bace1c5af8f0c0ee124544b0c09af0519813..fbb65bf3330a0697596a07bc1a13bc87863fc89d 100644
--- a/components/offline_pages/core/background/request_coordinator.h
+++ b/components/offline_pages/core/background/request_coordinator.h
@@ -23,6 +23,8 @@
 #include "components/offline_pages/core/background/request_coordinator_event_logger.h"
 #include "components/offline_pages/core/background/request_notifier.h"
 #include "components/offline_pages/core/background/request_queue.h"
+#include "components/offline_pages/core/background/resource_data_type.h"
+#include "components/offline_pages/core/background/resource_tracker_observer.h"
 #include "components/offline_pages/core/background/scheduler.h"
 #include "net/nqe/network_quality_estimator.h"
 #include "url/gurl.h"
@@ -38,7 +40,8 @@ class ClientPolicyController;
 // Coordinates queueing and processing save page later requests.
 class RequestCoordinator : public KeyedService,
                            public RequestNotifier,
-                           public base::SupportsUserData {
+                           public base::SupportsUserData,
+                           public ResourceTrackerObserver {
  public:
   // Nested observer class.  To make sure that no events are missed, the client
   // code should first register for notifications, then |GetAllRequests|, and
@@ -181,6 +184,13 @@ class RequestCoordinator : public KeyedService,
 
   void StartImmediatelyForTest() { StartImmediatelyIfConnected(); }
 
+  // Implementation of ResourceTrackerObserver interface
+  // When we are notified of a resource load starting or ending, pass the
+  // information along to the offliner.
+  void ObserveResourceTracking(const ResourceDataType type,
+                               int64_t started_count,
+                               int64_t completed_count) override;
+
   // Observers implementing the RequestCoordinator::Observer interface can
   // register here to get notifications of changes to request state.  This
   // pointer is not owned, and it is the callers responsibility to remove the