Mark "low importance" and "owned" changes in the filetree

Summary: Ref T13516. Mark low-importance changes (generated code, deleted files) and owned-with-authority changes in the filetree.

Test Plan: {F7375327}

Maniphest Tasks: T13516

Differential Revision: https://secure.phabricator.com/D21157

webroot/rsrc/js/application/diff/DiffPathView.js

@@ -23,6 +23,8 @@ JX.install('DiffPathView', {
     _inlineNode: null,
     _isDirectory: false,
     _displayPath: null,
+    _isOwned: false,
+    _isLowImportance: false,
 
     getNode: function() {
       if (!this._node) {
@@ -119,6 +121,27 @@ JX.install('DiffPathView', {
       return this;
     },
 
+    setIsLowImportance: function(low_importance) {
+      this._isLowImportance = low_importance;
+
+      var node = this.getNode();
+      JX.DOM.alterClass(
+        node,
+        'diff-tree-path-low-importance',
+        this._isLowImportance);
+
+      return this;
+    },
+
+    setIsOwned: function(owned) {
+      this._isOwned = owned;
+
+      var node = this.getNode();
+      JX.DOM.alterClass(node, 'diff-tree-path-owned', this._isOwned);
+
+      return this;
+    },
+
     _onclick: function(e) {
       if (!e.isNormalClick()) {
         return;