Printing: PDFs should only be fit to page if there is a size mismatch.

pdf/instance.cc

Index: pdf/instance.cc
diff --git a/pdf/instance.cc b/pdf/instance.cc
index 724f7d664c2f1a26c82912bbfaa65279d5026c68..f32129163c8a78695f878a3c2826c0714b96ec1b 100644
--- a/pdf/instance.cc
+++ b/pdf/instance.cc
@@ -677,6 +677,10 @@ void Instance::GetPrintPresetOptionsFromDocument(
   options->duplex =
       static_cast<PP_PrivateDuplexMode_Dev>(engine_->GetDuplexType());
   options->copies = engine_->GetCopiesToPrint();
+  pp::Size uniform_page_size;
+  options->is_page_size_uniform =
+      PP_FromBool(engine_->GetPageSizeAndUniformity(&uniform_page_size));
+  options->uniform_page_size = PP_Size(uniform_page_size);
 }
 
 pp::Var Instance::GetLinkAtPosition(const pp::Point& point) {