Revert 150436 - gdata: Remove hide_hosted_documents from ReadDirectoryCallback

chrome/browser/chromeos/gdata/gdata_file_system.h

Index: chrome/browser/chromeos/gdata/gdata_file_system.h
===================================================================
--- chrome/browser/chromeos/gdata/gdata_file_system.h	(revision 150519)
+++ chrome/browser/chromeos/gdata/gdata_file_system.h	(working copy)
@@ -600,6 +600,9 @@
   void FindEntryByPathSyncOnUIThread(const FilePath& search_file_path,
                                      const FindEntryCallback& callback);
 
+  // Changes state of hosted documents visibility, triggers directory refresh.
+  void SetHideHostedDocuments(bool hide);
+
   // Initializes preference change observer.
   void InitializePreferenceObserver();
 
@@ -794,6 +797,9 @@
   // Periodic timer for checking updates.
   base::Timer update_timer_;
 
+  // True if hosted documents should be hidden.
+  bool hide_hosted_docs_;
+
   // The set of paths opened by OpenFile but not yet closed by CloseFile.
   std::set<FilePath> open_files_;