[Offline Pages] Add cached offline page utils and show usage in settings.

chrome/browser/ui/webui/options/chromeos/storage_manager_handler.h

Index: chrome/browser/ui/webui/options/chromeos/storage_manager_handler.h
diff --git a/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.h b/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.h
index f1785b51a1d901c2c1073776764085d51af4c58a..052524e3518439cc34e673c4d4257cb66dc76171 100644
--- a/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.h
+++ b/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.h
@@ -70,7 +70,7 @@ class StorageManagerHandler : public ::options::OptionsPageUIHandler {
   void UpdateBrowsingDataSize();
 
   // Callback to receive the cache size.
-  void OnGetCacheSize(int64_t size, bool is_upper_limit);
+  void OnGetCacheSize(bool is_upper_limit, int64_t size);
 
   // Callback to update the UI about the size of browsing data.
   void OnGetBrowsingDataSize(bool is_site_data, int64_t size);