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

chrome/browser/offline_pages/background_loader_offliner.h

Index: chrome/browser/offline_pages/background_loader_offliner.h
diff --git a/chrome/browser/offline_pages/background_loader_offliner.h b/chrome/browser/offline_pages/background_loader_offliner.h
index cab1a501d94d03c14cc9f975a9882390134aff73..26ed7f98c4b38a0bb8ce5f9aa26c3ad4bad84e0a 100644
--- a/chrome/browser/offline_pages/background_loader_offliner.h
+++ b/chrome/browser/offline_pages/background_loader_offliner.h
@@ -12,6 +12,7 @@
 #include "base/values.h"
 #include "components/offline_pages/content/background_loader/background_loader_contents.h"
 #include "components/offline_pages/core/background/offliner.h"
+#include "components/offline_pages/core/background/resource_data_type.h"
 #include "components/offline_pages/core/offline_page_types.h"
 #include "components/offline_pages/core/snapshot_controller.h"
 #include "content/public/browser/web_contents_observer.h"
@@ -46,6 +47,9 @@ class BackgroundLoaderOffliner : public Offliner,
                    const ProgressCallback& progress_callback) override;
   bool Cancel(const CancelCallback& callback) override;
   bool HandleTimeout(int64_t request_id) override;
+  void ObserveResourceTracking(const ResourceDataType type,
+                               int64_t started_count,
+                               int64_t completed_count) override;
 
   // WebContentsObserver implementation.
   void DocumentAvailableInMainFrame() override;
@@ -93,6 +97,10 @@ class BackgroundLoaderOffliner : public Offliner,
 
   void DeleteOfflinePageCallback(const SavePageRequest& request,
                                  DeletePageResult result);
+  // Add a resource loading signal as we observe it.
+  void AddResourceSignal(const ResourceDataType type,
+                         int64_t started_count,
+                         int64_t completed_count);
 
   std::unique_ptr<background_loader::BackgroundLoaderContents> loader_;
   // Not owned.