Proxy the PPP_Printing interface

ppapi/api/dev/ppp_printing_dev.idl

 /* 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.
  */
 
 /**
  * Implementation of the Printing interface.
  */
 
 label Chrome {
@@ skipping 51 matching lines @@
    * pages required for the print output at the given page size (0 indicates
    * a failure).
    */
   int32_t Begin([in] PP_Instance instance,
                 [in] PP_PrintSettings_Dev print_settings);
 
   /**
    * Prints the specified pages using the format specified in Begin.
    * Returns a resource that represents the printed output.
    * This is a PPB_ImageData resource if the output format is
-   * PP_PrintOutputFormat_Raster and a PPB_Blob otherwise. Returns 0 on
+   * PP_PrintOutputFormat_Raster and a PPB_Buffer otherwise. Returns 0 on
    * failure.
    */
   PP_Resource PrintPages([in] PP_Instance instance,
                          [in] PP_PrintPageNumberRange_Dev page_ranges,
                          [in] uint32_t page_range_count);
 
   /** Ends the print session. Further calls to PrintPage will fail. */
   void End([in] PP_Instance instance);
 
   /**
    *  Returns true if the current content should be printed into the full page
    *  and not scaled down to fit within the printer's printable area.
    */
   PP_Bool IsScalingDisabled([in] PP_Instance instance);
 };