PrintPreview: Honor the print media page size and margin values.

printing/pdf_metafile_cg_mac.cc

Index: printing/pdf_metafile_cg_mac.cc
diff --git a/printing/pdf_metafile_cg_mac.cc b/printing/pdf_metafile_cg_mac.cc
index 78c1110a8eb13f82b04034c21b6915ff4d156195..bf2f68dd5942d66da747c64170451110aa1d8721 100644
--- a/printing/pdf_metafile_cg_mac.cc
+++ b/printing/pdf_metafile_cg_mac.cc
@@ -202,20 +202,16 @@ bool PdfMetafileCg::RenderPage(unsigned int page_number,
     }
   }
   // Some PDFs have a non-zero origin. Need to take that into account.
-  float x_offset = rect.origin.x - (source_rect.origin.x * scaling_factor);
-  float y_offset = rect.origin.y - (source_rect.origin.y * scaling_factor);
+  float x_offset = -1 * source_rect.origin.x * scaling_factor;
+  float y_offset = -1 * source_rect.origin.y * scaling_factor;
 
-  if (center_vertically) {
+  if (center_horizontally) {
     x_offset += (rect.size.width -
                      (source_rect.size.width * scaling_factor))/2;
   }
-  if (center_horizontally) {
+  if (center_vertically) {
     y_offset += (rect.size.height -
                      (source_rect.size.height * scaling_factor))/2;
-  } else {
-    // Since 0 y begins at the bottom, we need to adjust so the output appears
-    // nearer the top if we are not centering horizontally.
-    y_offset += rect.size.height - (source_rect.size.height * scaling_factor);
   }
   CGContextSaveGState(context);
   CGContextTranslateCTM(context, x_offset, y_offset);