[Chrome] Support NumCopies print preset

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.
  */
 
 /**
  * Definition of the PPP_Printing interface.
  */
 
 // Note: This version should always match the PPB_Printing_Dev interface.
 label Chrome {
-  M21 = 0.6
+  M21 = 0.6,
+  M37 = 0.7
 };
 
 /**
  * Specifies a contiguous range of page numbers to be printed.
  * The page numbers use a zero-based index.
  */
 [assert_size(8)]
 struct PP_PrintPageNumberRange_Dev {
   uint32_t first_page_number;
   uint32_t last_page_number;
@@ skipping 27 matching lines @@
                          [in] uint32_t page_range_count);
 
   /** 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);
+  /**
+   *  Returns the number of copies to be printed.
+   */
+  int32_t GetCopiesToPrint([in] PP_Instance instance);

[yzshen1, 2014/07/16 16:10:46]

You need to add [version=0.7] for this method.

Besides, please consider sending a mail to the pepper team about your proposed
interface change.

[Nikhil, 2014/07/16 17:42:01]

Thanks for reviewing. When I tried adding [version=0.7] earlier, I was not able
to upload the patch. It gave presubmit error and suggested to run the generator
(I didn't know what to do for this).

I'll email pepper team explaining the requirement and proposed change.

[Nikhil, 2014/07/29 10:12:07]

Done.

 };