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

components/offline_pages/core/background/offliner.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_OFFLINER_H_
 #define COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_OFFLINER_H_
 
 #include <string>
 
 #include "base/callback.h"
+#include "components/offline_pages/core/background/resource_data_type.h"
 
 namespace offline_pages {
 
 class SavePageRequest;
 
 // Interface of a class responsible for constructing an offline page given
 // a request with a URL.
 class Offliner {
  public:
   // Status of processing an offline page request.
@@ skipping 74 matching lines @@
   // Clears the currently processing request, if any, and skips running its
   // CompletionCallback. Returns false if there is nothing to cancel, otherwise
   // returns true and canceled request will be delivered using callback.
   virtual bool Cancel(const CancelCallback& callback) = 0;
 
   // Handles timeout scenario. Returns true if lowbar is met and try to do a
   // snapshot of the current webcontents. If that is the case, the result of
   // 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.
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_OFFLINER_H_