Use DPI from Print Preview on Windows, handle non square

printing/printing_context_win.cc

 // 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.
 
 #include "printing/printing_context_win.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 170 matching lines @@
         dev_mode->dmDuplex = DMDUP_SIMPLEX;
         break;
       default:  // UNKNOWN_DUPLEX_MODE
         break;
     }
 
     dev_mode->dmFields |= DM_ORIENTATION;
     dev_mode->dmOrientation = settings_.landscape() ? DMORIENT_LANDSCAPE :
                                                       DMORIENT_PORTRAIT;
 
+    if (settings_.dpi_horizontal() > 0) {
+      dev_mode->dmPrintQuality = settings_.dpi_horizontal();
+      dev_mode->dmFields |= DM_PRINTQUALITY;
+    }
+    if (settings_.dpi_vertical() > 0) {
+      dev_mode->dmYResolution = settings_.dpi_vertical();
+      dev_mode->dmFields |= DM_YRESOLUTION;
+    }
+
     const PrintSettings::RequestedMedia& requested_media =
         settings_.requested_media();
     static const int kFromUm = 100;  // Windows uses 0.1mm.
     int width = requested_media.size_microns.width() / kFromUm;
     int height = requested_media.size_microns.height() / kFromUm;
     unsigned id = 0;
     if (base::StringToUint(requested_media.vendor_id, &id) && id) {
       dev_mode->dmFields |= DM_PAPERSIZE;
       dev_mode->dmPaperSize = static_cast<short>(id);
     } else if (width > 0 && height > 0) {
@@ skipping 163 matching lines @@
   if (view && view->GetHost())
     window = view->GetHost()->GetAcceleratedWidget();
   if (!window) {
     // TODO(maruel):  b/1214347 Get the right browser window instead.
     return GetDesktopWindow();
   }
   return window;
 }
 
 }  // namespace printing