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

pdf/pdf_engine.h

Index: pdf/pdf_engine.h
diff --git a/pdf/pdf_engine.h b/pdf/pdf_engine.h
index bcfa7e6475e907400e5e56f4bd6b76f89067a8fe..e99ab47ed878b69ae99124b86aad22db2d62c29e 100644
--- a/pdf/pdf_engine.h
+++ b/pdf/pdf_engine.h
@@ -252,6 +252,8 @@ class PDFEngine {
   virtual int GetCopiesToPrint() = 0;
   // Returns the duplex setting.
   virtual int GetDuplexType() = 0;
+  // Returns true if all the pages are the same size.
+  virtual bool GetPageSizeAndUniformity(pp::Size* size) = 0;
 
   // Returns a VarArray of Bookmarks, each a VarDictionary containing the
   // following key/values: