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

third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js

Index: third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
index 2d14c927f43f2ce9f99c5ec51dd5dd99f96e5af2..9e3cef25b811bf396fb72a3a23b7294252d59fd5 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
@@ -118,8 +118,7 @@ Network.NetworkLogViewColumns = class {
   }
 
   _setupWaterfall() {
-    this._waterfallColumn =
-        new Network.NetworkWaterfallColumn(this._networkLogView.rowHeight(), this._networkLogView.calculator());
+    this._waterfallColumn = new Network.NetworkWaterfallColumn(this._networkLogView.calculator());
 
     this._waterfallColumn.element.addEventListener('contextmenu', handleContextMenu.bind(this));
     this._waterfallColumn.element.addEventListener('mousewheel', this._onMouseWheel.bind(this, false), {passive: true});
@@ -235,11 +234,12 @@ Network.NetworkLogViewColumns = class {
 
   _updateRowsSize() {
     var largeRows = !!this._networkLogLargeRowsSetting.get();
+
     this._dataGrid.element.classList.toggle('small', !largeRows);
     this._dataGrid.scheduleUpdate();
 
     this._waterfallScrollerWidthIsStale = true;
-    this._waterfallColumn.setRowHeight(this._networkLogView.rowHeight());
+    this._waterfallColumn.setRowHeight(largeRows ? 41 : 21);

[allada, 2017/05/16 21:40:06]

then here, we can just query what the size is here from the setting without 41
and 21 in two places.

     this._waterfallScroller.classList.toggle('small', !largeRows);
     this._waterfallHeaderElement.classList.toggle('small', !largeRows);
     this._waterfallColumn.setHeaderHeight(this._waterfallScroller.offsetTop);