Add PDF print scale factor setting (issue #2106)

include/internal/cef_types.h

@@ -2395,6 +2395,13 @@ typedef struct _cef_pdf_print_settings_t {
   int page_width;
   int page_height;
 
+  ///
+  // The percentage to scale the PDF by before printing (e.g. 50 is 50%).
+  // If this value is less than or equal to zero the default value of 100
+  // will be used.
+  ///
+  int scale_factor;
+
   ///
   // Margins in millimeters. Only used if |margin_type| is set to
   // PDF_PRINT_MARGIN_CUSTOM.

include/internal/cef_types_wrappers.h

@@ -937,6 +937,8 @@ struct CefPdfPrintSettingsTraits {
     target->page_width = src->page_width;
     target->page_height = src->page_height;
 
+    target->scale_factor = src->scale_factor;
+
     target->margin_top = src->margin_top;
     target->margin_right = src->margin_right;
     target->margin_bottom = src->margin_bottom;