Async frame preparation for Preview with support if selection.

printing/printing_context.cc

Index: printing/printing_context.cc
diff --git a/printing/printing_context.cc b/printing/printing_context.cc
index a29b31a6947dab4b9db58d7d62364ce6f5adc8c4..407e3bb4c66c1c12e34c12e072664d1dbcedd8d5 100644
--- a/printing/printing_context.cc
+++ b/printing/printing_context.cc
@@ -84,6 +84,11 @@ PrintingContext::Result PrintingContext::UpdatePrintSettings(
     NOTREACHED();
   }
 
+  if (!job_settings.GetBoolean(kSettingShouldPrintSelectionOnly,
+                               &settings_.selection_only)) {
+    NOTREACHED();
+  }
+
   return result;
 }