Add values to all dev Pepper .idl enumerations.

ppapi/api/dev/ppb_file_chooser_dev.idl

 /* Copyright (c) 2011 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 /**
  * This file defines the <code>PPB_FileChooser_Dev</code> interface.
  */
 
 label Chrome {
   M16 = 0.5
 };
 
 /**
  * This enumeration contains constants to control the behavior of the file
  * chooser dialog.
  */
 [assert_size(4)]
 enum PP_FileChooserMode_Dev {
   /**
    * Mode for choosing a single existing file.
    */
   PP_FILECHOOSERMODE_OPEN = 0,
   /**
    * Mode for choosing multiple existing files.
    */
-  PP_FILECHOOSERMODE_OPENMULTIPLE
+  PP_FILECHOOSERMODE_OPENMULTIPLE = 1
 };
 
 interface PPB_FileChooser_Dev {
  /**
   * This function creates a file chooser dialog resource.  The chooser is
   * associated with a particular instance, so that it may be positioned on the
   * screen relative to the tab containing the instance.
   *
   * @param[in] instance A <code>PP_Instance</code> identifying one instance
   * of a module.
@@ skipping 54 matching lines @@
    *
    * @param[in] chooser The file chooser resource.
    *
    * @return A <code>PP_Resource</code> containing the next file chosen by the
    * user, or 0 if there are no more files.
    */
   PP_Resource GetNextChosenFile(
       [in] PP_Resource chooser);
 };