PPAPI: Add Quota info to PPB_FileSystem::Open doc

ppapi/c/ppb_file_system.h

 /* Copyright (c) 2012 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.
  */
 
-/* From ppb_file_system.idl modified Mon Mar 19 11:36:09 2012. */
+/* From ppb_file_system.idl modified Mon May 21 15:19:32 2012. */
 
 #ifndef PPAPI_C_PPB_FILE_SYSTEM_H_
 #define PPAPI_C_PPB_FILE_SYSTEM_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_file_info.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_resource.h"
@@ skipping 38 matching lines @@
    * <code>PPB_FileSystem</code>, <code>PP_FALSE</code> if the resource is
    * invalid or some type other than <code>PPB_FileSystem</code>.
    */
   PP_Bool (*IsFileSystem)(PP_Resource resource);
   /**
    * Open() opens the file system. A file system must be opened before running
    * any other operation on it.
    *
    * @param[in] file_system A <code>PP_Resource</code> corresponding to a file
    * system.
-   * @param[in] expected_size The expected size of the file system.
+   *
+   * @param[in] expected_size The expected size of the file system. Note that
+   * this does not request quota; to do that, you must either invoke
+   * requestQuota from JavaScript:
+
+
+    * http://www.html5rocks.com/en/tutorials/file/filesystem/#toc-requesting-quota
+   * or set the unlimitedStorage permission for Chrome Web Store apps:
+   * http://code.google.com/chrome/extensions/manifest.html#permissions
+   *
    * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
    * completion of Open().
    *
    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
    */
   int32_t (*Open)(PP_Resource file_system,
                   int64_t expected_size,
                   struct PP_CompletionCallback callback);
   /**
    * GetType() returns the type of the provided file system.
    *
    * @param[in] file_system A <code>PP_Resource</code> corresponding to a file
    * system.
    *
    * @return A <code>PP_FileSystemType</code> with the file system type if
    * valid or <code>PP_FILESYSTEMTYPE_INVALID</code> if the provided resource
    * is not a valid file system. It is valid to call this function even before
    * Open() completes.
    */
   PP_FileSystemType (*GetType)(PP_Resource file_system);
 };
 
 typedef struct PPB_FileSystem_1_0 PPB_FileSystem;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_FILE_SYSTEM_H_ */