DevTools -> Memory Tab -> Allowing to edit a title of a heap snapshot

third_party/WebKit/Source/devtools/front_end/profiler/HeapSnapshotView.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 148 matching lines @@
     this._popoverHelper.setHasPadding(true);
     this.element.addEventListener('scroll', this._popoverHelper.hidePopover.bind(this._popoverHelper), true);
 
     this._currentPerspectiveIndex = 0;
     this._currentPerspective = this._perspectives[0];
     this._currentPerspective.activate(this);
     this._dataGrid = this._currentPerspective.masterGrid(this);
 
     this._populate();
     this._searchThrottler = new Common.Throttler(0);
+
+    for (var existingProfile of this._profiles())
+      existingProfile.addEventListener(Profiler.ProfileHeader.Events.ProfileTitleChanged, this._updateControls, this);
   }
 
   /**
    * @return {!UI.SearchableView}
    */
   searchableView() {
     return this._searchableView;
   }
 
   /**
@@ skipping 421 matching lines @@
     const multipleSnapshots = this._profiles().length > 1;
     this._perspectiveSelect.removeOptions();
     this._perspectives.forEach((perspective, index) => {
       if (multipleSnapshots || perspective !== this._comparisonPerspective)
         this._perspectiveSelect.createOption(perspective.title(), '', String(index));
     });
   }
 
   _updateBaseOptions() {
     var list = this._profiles();
-    // We're assuming that snapshots can only be added.
-    if (this._baseSelect.size() === list.length)
-      return;
+    var selectedIndex = this._baseSelect.selectedIndex();
 
-    for (var i = this._baseSelect.size(), n = list.length; i < n; ++i) {
-      var title = list[i].title;
-      this._baseSelect.createOption(title);
-    }
+    this._baseSelect.removeOptions();
+    for (var item of list)
+      this._baseSelect.createOption(item.title);
+
+    if (selectedIndex > -1)
+      this._baseSelect.setSelectedIndex(selectedIndex);
   }
 
   _updateFilterOptions() {
     var list = this._profiles();
-    // We're assuming that snapshots can only be added.
-    if (this._filterSelect.size() - 1 === list.length)
-      return;
+    var selectedIndex = this._filterSelect.selectedIndex();
 
-    if (!this._filterSelect.size())
-      this._filterSelect.createOption(Common.UIString('All objects'));
-
-    for (var i = this._filterSelect.size() - 1, n = list.length; i < n; ++i) {
-      var title = list[i].title;
+    this._filterSelect.removeOptions();
+    this._filterSelect.createOption(Common.UIString('All objects'));
+    for (var i = 0; i < list.length; ++i) {
+      var title;
       if (!i)
-        title = Common.UIString('Objects allocated before %s', title);
+        title = Common.UIString('Objects allocated before %s', list[i].title);
       else
-        title = Common.UIString('Objects allocated between %s and %s', list[i - 1].title, title);
+        title = Common.UIString('Objects allocated between %s and %s', list[i - 1].title, list[i].title);
       this._filterSelect.createOption(title);
     }
+
+    if (selectedIndex > -1)
+      this._filterSelect.setSelectedIndex(selectedIndex);
   }
 
   _updateControls() {
     this._updatePerspectiveOptions();
     this._updateBaseOptions();
     this._updateFilterOptions();
   }
 
   /**
    * @param {!Common.Event} event
    */
   _onReceiveSnapshot(event) {
     this._updateControls();
+    var profile = event.data;
+    profile.addEventListener(Profiler.ProfileHeader.Events.ProfileTitleChanged, this._updateControls, this);
   }
 
   /**
    * @param {!Common.Event} event
    */
   _onProfileHeaderRemoved(event) {
     var profile = event.data;
+    profile.removeEventListener(Profiler.ProfileHeader.Events.ProfileTitleChanged, this._updateControls, this);
+
     if (this._profile === profile) {
       this.detach();
       this._profile.profileType().removeEventListener(
           Profiler.HeapSnapshotProfileType.SnapshotReceived, this._onReceiveSnapshot, this);
       this._profile.profileType().removeEventListener(
           Profiler.ProfileType.Events.RemoveProfileHeader, this._onProfileHeaderRemoved, this);
       this.dispose();
     } else {
       this._updateControls();
     }
@@ skipping 1307 matching lines @@
           frame.line - 1, frame.column - 1);
       frameDiv.appendChild(urlElement);
     }
   }
 
   clear() {
     this.element.removeChildren();
     this._linkifier.reset();
   }
 };