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

chrome/browser/android/offline_pages/background_loader_offliner.cc

Index: chrome/browser/android/offline_pages/background_loader_offliner.cc
diff --git a/chrome/browser/android/offline_pages/background_loader_offliner.cc b/chrome/browser/android/offline_pages/background_loader_offliner.cc
index b2fc873f41f19a28d41c4e6e0346492aa7528c5c..6c51aa3c18e67398a2048db7b56c9411e8ae0e9d 100644
--- a/chrome/browser/android/offline_pages/background_loader_offliner.cc
+++ b/chrome/browser/android/offline_pages/background_loader_offliner.cc
@@ -238,6 +238,15 @@ bool BackgroundLoaderOffliner::HandleTimeout(int64_t request_id) {
   return false;
 }
 
+void BackgroundLoaderOffliner::ObserveResourceTracking(
+    const ResourceDataType type,
+    int64_t started_count,
+    int64_t completed_count) {
+  // Add the signal to extra data, and use for tracking.
+  if (type == ResourceDataType::IMAGE)
+    AddResourceSignal(type, started_count, completed_count);
+}
+
 void BackgroundLoaderOffliner::MarkLoadStartTime() {
   load_start_time_ = base::TimeTicks::Now();
 }
@@ -493,6 +502,17 @@ void BackgroundLoaderOffliner::AddLoadingSignal(const char* signal_name) {
   signal_data_.SetDouble(signal_name, delay);
 }
 
+void BackgroundLoaderOffliner::AddResourceSignal(const ResourceDataType type,
+                                                 int64_t started_count,
+                                                 int64_t completed_count) {
+  double percentage = 100.0 * static_cast<double>(completed_count) /
+                      static_cast<double>(started_count);
+  // TODO(petewil): Use actual signal type instead of hardcoding name to image.
+  signal_data_.SetDouble("ImagePercentage", percentage);
+  signal_data_.SetDouble("StartedImages", started_count);
+  signal_data_.SetDouble("CompletedImages", completed_count);
+}
+
 }  // namespace offline_pages
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(offline_pages::OfflinerData);