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

components/offline_pages/core/background/offliner.h

Index: components/offline_pages/core/background/offliner.h
diff --git a/components/offline_pages/core/background/offliner.h b/components/offline_pages/core/background/offliner.h
index c24aa46300745edaca26dcec929a82796cc605e7..6c861620acab132320977f4f409cca578cf602cc 100644
--- a/components/offline_pages/core/background/offliner.h
+++ b/components/offline_pages/core/background/offliner.h
@@ -70,6 +70,23 @@ class Offliner {
     STATUS_COUNT
   };
 
+  enum ResourceDataType {
+    APPLICATION,
+    MEDIA,
+    EXAMPLE,
+    IMAGE,
+    MESSAGE,
+    MODEL,
+    MULTIPART,
+    TEXT_CSS,
+    TEXT_HTML,
+    TEXT_PLAIN,
+    TEXT_SCRIPT,
+    XHR,
+    OTHER,
+    RESOURCE_DATA_TYPE_COUNT,
+  };
+
   // Reports the load progress of a request.
   typedef base::Callback<void(const SavePageRequest&, int64_t received_bytes)>
       ProgressCallback;
@@ -102,6 +119,12 @@ class Offliner {
   // offlining will be provided by |completion_callback|.
   virtual bool HandleTimeout(int64_t request_id) = 0;
 
+  // We are notified of a resource load starting or ending, we can use this
+  // for tracking loading signals.
+  virtual void ObserveResourceTracking(const ResourceDataType type,
+                                       int64_t started_count,
+                                       int64_t completed_count) = 0;
+
   // TODO(dougarnett): add policy support methods.
 };