DevTools: fix network grid scroll to bottom, render group node frame icon.

third_party/WebKit/Source/devtools/front_end/network/networkLogView.css

 /*
  * Copyright (C) 2013 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 341 matching lines @@
     bottom: 1px;
     display: flex;
     align-items: center;
 }
 
 .network-waterfall-header .sort-order-icon {
     align-items: center;
     margin-right: 4px;
     margin-bottom: -2px;
 }
+
+.network-frame-group-icon {
+    display: inline-block;
+    margin: -8px -2px;
+}
+
+.network-frame-group-badge {
+    margin-right: 4px;
+}