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

chrome/browser/android/offline_pages/prerendering_offliner.cc

 // 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.
 
 #include "chrome/browser/android/offline_pages/prerendering_offliner.h"
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/sys_info.h"
@@ skipping 276 matching lines @@
          pending_request_->completed_attempt_count() + 1 >=
              policy_->GetMaxCompletedTries())) {
       saved_on_last_retry_ = true;
       GetOrCreateLoader()->StartSnapshot();
       return true;
     }
   }
   return false;
 }
 
+void PrerenderingOffliner::ObserveResourceTracking(const ResourceDataType type,
+                                                   int64_t started_count,
+                                                   int64_t completed_count) {
+  // Add the signal to extra data, and use for tracking.
+  loader_->ObserveResourceTracking(type, started_count, completed_count);
+}
+
 void PrerenderingOffliner::SetLoaderForTesting(
     std::unique_ptr<PrerenderingLoader> loader) {
   DCHECK(!loader_);
   loader_ = std::move(loader);
 }
 
 void PrerenderingOffliner::SetLowEndDeviceForTesting(bool is_low_end_device) {
   is_low_end_device_ = is_low_end_device;
 }
 
@@ skipping 25 matching lines @@
           base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES) {
     DVLOG(1) << "App became active, canceling current offlining request";
     // No need to check the return value or complete early, as false would
     // indicate that there was no request, in which case the state change is
     // ignored.
     Cancel(
         base::Bind(HandleApplicationStateChangeCancel, completion_callback_));
   }
 }
 }  // namespace offline_pages