Add isWritableFileEntry to the fileSystem API

chrome/common/extensions/api/file_system.idl

Index: chrome/common/extensions/api/file_system.idl
diff --git a/chrome/common/extensions/api/file_system.idl b/chrome/common/extensions/api/file_system.idl
index 7d9928eb7456edceb02499f1f9987ba1c4a8c938..826d87ec1e35ac24cd12cd3c6311f85b959b512f 100644
--- a/chrome/common/extensions/api/file_system.idl
+++ b/chrome/common/extensions/api/file_system.idl
@@ -20,7 +20,8 @@ namespace fileSystem {
     DOMString? type;
   };
   callback GetDisplayPathCallback = void (DOMString displayPath);
-  callback FileEntryCallback = void ([instanceOf=fileEntry] object fileEntry);
+  callback FileEntryCallback = void ([instanceOf=FileEntry] object fileEntry);
+  callback IsWritableCallback = void (boolean isWritable);
 
   interface Functions {
     // Get the display path of a FileEntry object. The display path is based on
@@ -34,6 +35,10 @@ namespace fileSystem {
     static void getWritableFileEntry([instanceOf=FileEntry] object fileEntry,
                                      FileEntryCallback callback);
 
+    // Gets whether this FileEntry is readable or writable.

[benwells, 2012/07/10 06:40:23]

Nit: ...is writable or not.

[thorogood, 2012/07/10 06:49:22]

Done.

+    static void isWritableFileEntry([instanceOf=FileEntry] object fileEntry,
+                                    IsWritableCallback callback);
+
     // Ask the user to choose a file.
     static void chooseFile(optional ChooseFileOptions options,
                            FileEntryCallback callback);