[MD Extensions] Include the manifest code snippet in load errors

chrome/browser/resources/md_extensions/code_section.js

Index: chrome/browser/resources/md_extensions/code_section.js
diff --git a/chrome/browser/resources/md_extensions/code_section.js b/chrome/browser/resources/md_extensions/code_section.js
index d0a93e2aac26986641c78f2ba764867322b36546..939e433b63be9798a795528b56db3145b4c42ebe 100644
--- a/chrome/browser/resources/md_extensions/code_section.js
+++ b/chrome/browser/resources/md_extensions/code_section.js
@@ -48,11 +48,13 @@ cr.define('extensions', function() {
     },
 
     /**
+     * Returns true if no code could be displayed.

[michaelpg, 2017/03/24 02:59:01]

As above, I'm asking myself *why* the code couldn't be displayed.

[Devlin, 2017/03/24 16:03:08]

added "e.g. because the file could not be loaded."

      * @return {boolean}
-     * @private
      */
-    isMainHidden_: function() {
-      return !this.code;
+    isEmpty: function() {

[michaelpg, 2017/03/24 02:59:01]

nit: move above @private method

[Devlin, 2017/03/24 16:03:08]

Done.

+      return !this.code ||
+             (!this.code.beforeHighlight && !this.code.highlight &&
+              !this.code.afterHighlight);
     },
   });