[Blink] Support NumCopies print preset

public/web/WebPlugin.h

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 96 matching lines @@
     virtual void didFailLoadingFrameRequest(
         const WebURL&, void* notifyData, const WebURLError&) = 0;
 
     // Printing interface.
     // Whether the plugin supports its own paginated print. The other print
     // interface methods are called only if this method returns true.
     virtual bool supportsPaginatedPrint() { return false; }
     // Returns true if the printed content should not be scaled to
     // the printer's printable area.
     virtual bool isPrintScalingDisabled() { return false; }
+    // Returns number of copies to be printed.
+    virtual int getCopiesToPrint() { return 1; }
 
     // Sets up printing with the specified printParams. Returns the number of
     // pages to be printed at these settings.
     virtual int printBegin(const WebPrintParams& printParams) { return 0; }
 
     // Prints the page specified by pageNumber (0-based index) into the supplied canvas.
     virtual bool printPage(int pageNumber, WebCanvas* canvas) { return false; }
     // Ends the print operation.
     virtual void printEnd() { }
 
@@ skipping 44 matching lines @@
     virtual bool isPlaceholder() { return true; }
     virtual bool shouldPersist() const { return false; }
 
 protected:
     ~WebPlugin() { }
 };
 
 } // namespace blink
 
 #endif