Print Preview: Increase max size to 70% of width in large windows

Increase the size of the dialog to 70% of the window width and a
proportional height, if the browser window is much larger than 1000x660.

Bug: 1033412
Change-Id: I9cf6bab3a5b38d57dba9f49d3f82aba850d61b60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1967805
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#724758}

chrome/browser/printing/print_preview_dialog_controller.cc

@@ -155,7 +155,11 @@ void PrintPreviewDialogDelegate::GetDialogSize(gfx::Size* size) const {
   size->Enlarge(-2 * kBorder, -kBorder);
 
   static const gfx::Size kMaxDialogSize(1000, 660);
-  size->SetToMin(kMaxDialogSize);
+  int max_width = std::max(size->width() * 7 / 10, kMaxDialogSize.width());
+  int max_height =
+      std::max(max_width * kMaxDialogSize.height() / kMaxDialogSize.width(),
+               kMaxDialogSize.height());
+  size->SetToMin(gfx::Size(max_width, max_height));
 }
 
 std::string PrintPreviewDialogDelegate::GetDialogArgs() const {