Print Preview: Adding UI for margin settings.

chrome/browser/resources/print_preview/print_header.js

Index: chrome/browser/resources/print_preview/print_header.js
diff --git a/chrome/browser/resources/print_preview/print_header.js b/chrome/browser/resources/print_preview/print_header.js
index fb95f97890ee60c2e2d69e4e5847f51fe0d663e6..0993ee631e820c196b9789347299414c4a9b2d8a 100644
--- a/chrome/browser/resources/print_preview/print_header.js
+++ b/chrome/browser/resources/print_preview/print_header.js
@@ -88,6 +88,12 @@ cr.define('print_preview', function() {
         return;
       }
 
+      if (!marginSettings.areMarginSettingsValid()) {
+        this.summary_.innerHTML =
+            localStrings.getString('invalidMarginSettings');
+        return;
+      }
+
       var pageSet = pageSettings.selectedPagesSet;
       var numOfSheets = pageSet.length;
       var summaryLabel =