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

components/offline_pages/core/background/offliner_stub.h

Index: components/offline_pages/core/background/offliner_stub.h
diff --git a/components/offline_pages/core/background/offliner_stub.h b/components/offline_pages/core/background/offliner_stub.h
index d6ddc2486bd70b8db6d7e1883aca550713305580..3a965b00042712d2882bf6773287a3e7c6eaa73c 100644
--- a/components/offline_pages/core/background/offliner_stub.h
+++ b/components/offline_pages/core/background/offliner_stub.h
@@ -27,6 +27,10 @@ class OfflinerStub : public Offliner {
 
   bool HandleTimeout(int64_t request_id) override;
 
+  void ObserveResourceTracking(const ResourceDataType type,
+                               int64_t started_count,
+                               int64_t completed_count) override;
+
   void disable_loading() { disable_loading_ = true; }
 
   void enable_callback(bool enable) { enable_callback_ = enable; }
@@ -37,6 +41,10 @@ class OfflinerStub : public Offliner {
 
   void enable_snapshot_on_last_retry() { snapshot_on_last_retry_ = true; }
 
+  void GetResourcePercentageCounts(const ResourceDataType type,
+                                   int64_t* started,
+                                   int64_t* completed);
+
  private:
   base::Closure completion_callback_;
   std::unique_ptr<SavePageRequest> pending_request_;
@@ -44,6 +52,8 @@ class OfflinerStub : public Offliner {
   bool enable_callback_;
   bool cancel_called_;
   bool snapshot_on_last_retry_;
+  int64_t started_count_;
+  int64_t completed_count_;
 };
 
 }  // namespace offline_pages