Fix TagWatcher when a text node is added.

The previous implementation was causing Javascript errors, when a text node got inserted to the document. This patch fixes this issue by checking if the inserted node is an Element node.

TEST=(1) Add a <webview...></webview> node in inspector, (2) add <div><webview...></webview></div> node, (3) add text node in inspector.
BUG=222663

Review URL: https://chromiumcodereview.appspot.com/14222005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194138 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 4 deletions

diff --git a/chrome/renderer/resources/extensions/tag_watcher.js b/chrome/renderer/resources/extensions/tag_watcher.js
index 815eb60..1f5aaa7 100644
--- a/chrome/renderer/resources/extensions/tag_watcher.js
+++ b/chrome/renderer/resources/extensions/tag_watcher.js
@@ -21,10 +21,11 @@ function watchForTag(tagName, cb) {
   var documentObserver = new WebKitMutationObserver(function(mutations) {
     forEach(mutations, function(i, mutation) {
       forEach(mutation.addedNodes, function(i, addedNode) {
-        if (addedNode.tagName == tagName) {
-          cb(addedNode);
+        if (addedNode.nodeType == Node.ELEMENT_NODE) {
+          if (addedNode.tagName == tagName)
+            cb(addedNode);
+          findChildTags(addedNode);
         }
-        findChildTags(addedNode);
       });
     });
   });
@@ -32,4 +33,3 @@ function watchForTag(tagName, cb) {
 }
 
 exports.watchForTag = watchForTag;
-