[Print Preview] Modified PP_PrintSettings_Dev interface to support auto fit to page functionality.

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 {
-  M14 = 0.5
+  M21 = 0.6
 };
 
 [assert_size(4)]
 enum PP_PrintOrientation_Dev {
   PP_PRINTORIENTATION_NORMAL         = 0,
   PP_PRINTORIENTATION_ROTATED_90_CW  = 1,
   PP_PRINTORIENTATION_ROTATED_180    = 2,
   PP_PRINTORIENTATION_ROTATED_90_CCW = 3
 };
 
 [assert_size(4)]
 enum PP_PrintOutputFormat_Dev {
   PP_PRINTOUTPUTFORMAT_RASTER     = 1u << 0,
   PP_PRINTOUTPUTFORMAT_PDF        = 1u << 1,
   PP_PRINTOUTPUTFORMAT_POSTSCRIPT = 1u << 2,
   PP_PRINTOUTPUTFORMAT_EMF        = 1u << 3
 };
 
-[assert_size(32)]
+[assert_size(4)]
+enum PP_PrintScalingOption_Dev {
+  PP_PRINTSCALINGOPTION_NONE = 0,
+  PP_PRINTSCALINGOPTION_FIT_TO_PRINTABLE_AREA = 1,
+  PP_PRINTSCALINGOPTION_SOURCE_SIZE = 2
+};
+
+[assert_size(60)]
 struct PP_PrintSettings_Dev {
   /** This is the size of the printable area in points (1/72 of an inch) */
   PP_Rect printable_area;
+  PP_Rect content_area;
+  PP_Size paper_size;
   int32_t dpi;
   PP_PrintOrientation_Dev orientation;
+  PP_PrintScalingOption_Dev print_scaling_option;
   PP_Bool grayscale;
   /** Note that Chrome currently only supports PDF printing. */
   PP_PrintOutputFormat_Dev format;
 };
 
 /**
  * Specifies a contiguous range of page numbers to be printed.
  * The page numbers use a zero-based index.
  */
 [assert_size(8)]
@@ skipping 32 matching lines @@
   /** Ends the print session. Further calls to PrintPages 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);
 };