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

chrome/browser/android/offline_pages/prerendering_loader.h

Index: chrome/browser/android/offline_pages/prerendering_loader.h
diff --git a/chrome/browser/android/offline_pages/prerendering_loader.h b/chrome/browser/android/offline_pages/prerendering_loader.h
index a3ed68cac63de00748494a65e6eca245ac193d46..d83f72d65ecc31450bf62a97702ed79e74d1714d 100644
--- a/chrome/browser/android/offline_pages/prerendering_loader.h
+++ b/chrome/browser/android/offline_pages/prerendering_loader.h
@@ -13,6 +13,7 @@
 #include "base/values.h"
 #include "chrome/browser/android/offline_pages/prerender_adapter.h"
 #include "components/offline_pages/core/background/offliner.h"
+#include "components/offline_pages/core/background/resource_data_type.h"
 #include "components/offline_pages/core/snapshot_controller.h"
 
 class GURL;
@@ -85,6 +86,10 @@ class PrerenderingLoader : public PrerenderAdapter::Observer,
   // Returns true if the lowbar of snapshotting a page is met.
   virtual bool IsLowbarMet();
 
+  void ObserveResourceTracking(const ResourceDataType type,
+                               int64_t started_count,
+                               int64_t completed_count);
+
   // Returns a JSON dictionary value for analysis of loading progress.
   const base::DictionaryValue& GetLoadingSignalData() { return signal_data_; }
 
@@ -116,6 +121,11 @@ class PrerenderingLoader : public PrerenderAdapter::Observer,
   // Add a signal to the signal data.
   void AddLoadingSignal(const char* signal_name);
 
+  // Add resource percentage based signal to the signal data.
+  void AddResourceSignal(const ResourceDataType type,
+                         int64_t started_count,
+                         int64_t completed_count);
+
   // Tracks loading state including whether the Loader is idle.
   State state_;