PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

ppapi/api/ppb_file_ref.idl

Index: ppapi/api/ppb_file_ref.idl
diff --git a/ppapi/api/ppb_file_ref.idl b/ppapi/api/ppb_file_ref.idl
index d9226471a9f23cc6e9c862369ef905c25a9731b5..7685836b24dbc0542bfb313004ec3c419a157fc3 100644
--- a/ppapi/api/ppb_file_ref.idl
+++ b/ppapi/api/ppb_file_ref.idl
@@ -10,7 +10,25 @@
 
 label Chrome {
   M14 = 1.0,
-  M28 = 1.1
+  M28 = 1.1,
+  [channel=dev] M34 = 1.2
+};
+
+/**
+ * The <code>PP_MakeDirectoryFlags</code> enum contains flags used to control
+ * behavior of <code>PPB_FileRef.MakeDirectory()</code>.
+ */
+enum PP_MakeDirectoryFlags {
+  PP_MAKEDIRECTORYFLAG_NONE           = 0 << 0,
+
+  /** Requests that ancestor directories are created if they do not exist. */
+  PP_MAKEDIRECTORYFLAG_WITH_ANCESTORS = 1 << 0,
+
+  /**
+   * Requests that the PPB_FileRef.MakeDirectory() call fails if the directory
+   * already exists.
+   */
+  PP_MAKEDIRECTORYFLAG_EXCLUSIVE      = 1 << 1
 };
 
 /**
@@ -105,17 +123,40 @@ interface PPB_FileRef {
    * @param[in] make_ancestors A <code>PP_Bool</code> set to
    * <code>PP_TRUE</code> to make ancestor directories or <code>PP_FALSE</code>
    * if ancestor directories are not needed.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of MakeDirectory().
    *
    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
    * Succeeds if the directory already exists. Fails if ancestor directories
    * do not exist and <code>make_ancestors</code> was passed as
    * <code>PP_FALSE</code>.
    */
+  [deprecate=1.2]
   int32_t MakeDirectory([in] PP_Resource directory_ref,
                         [in] PP_Bool make_ancestors,
                         [in] PP_CompletionCallback callback);
 
   /**
+   * MakeDirectory() makes a new directory in the file system according to the
+   * given <code>make_directory_flags</code>, which is a bit-mask of the
+   * <code>PP_MakeDirectoryFlags</code> values.  It is not valid to make a
+   * directory in the external file system.
+   *
+   * @param[in] file_ref A <code>PP_Resource</code> corresponding to a file
+   * reference.
+   * @param[in] make_directory_flags A bit-mask of the
+   * <code>PP_MakeDirectoryFlags</code> values.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of MakeDirectory().
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   */
+  [version=1.2]
+  int32_t MakeDirectory([in] PP_Resource directory_ref,
+                        [in] int32_t make_directory_flags,
+                        [in] PP_CompletionCallback callback);
+
+  /**
    * Touch() Updates time stamps for a file.  You must have write access to the
    * file if it exists in the external filesystem.
    *