Add support for directory access to the file system API.

apps/launcher.cc

Index: apps/launcher.cc
diff --git a/apps/launcher.cc b/apps/launcher.cc
index d3bc43c1d66c905017bf663c4124cc32b7cbfada..7091fb8c849b87f89675af0b99826a4560a5bb60 100644
--- a/apps/launcher.cc
+++ b/apps/launcher.cc
@@ -283,8 +283,12 @@ class PlatformAppPathLauncher
       return;
     }
 
-    GrantedFileEntry file_entry = CreateFileEntry(
-        profile_, extension_, host->render_process_host()->GetID(), file_path_);
+    GrantedFileEntry file_entry =
+        CreateFileEntry(profile_,
+                        extension_,
+                        host->render_process_host()->GetID(),
+                        file_path_,
+                        false);
     extensions::AppEventRouter::DispatchOnLaunchedEventWithFileEntry(
         profile_, extension_, handler_id_, mime_type, file_entry);
   }