Storage manager: Add site data size on the amount of browsing data.

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 c6e1629ba246801caa905d954fdc57b6db53c207..09f95ddf9d57be1e054dbbe91b3e9e8a2cb6ef75 100644
--- a/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.h
+++ b/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.h
@@ -11,6 +11,7 @@
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/browsing_data/site_data_size_collector.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 #include "components/arc/storage_manager/arc_storage_manager.h"
 #include "components/user_manager/user.h"
@@ -98,6 +99,9 @@ class StorageManagerHandler : public ::options::OptionsPageUIHandler {
   // Fetched sizes of user directories.
   std::vector<int64_t> user_sizes_;
 
+  // Helper to compute the total size of all types of site date.
+  std::unique_ptr<SiteDataSizeCollector> site_data_size_collector_;
+
   base::WeakPtrFactory<StorageManagerHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(StorageManagerHandler);