Add live popover icon property

atom/browser/ui/cocoa/atom_touch_bar.mm

@@ -333,10 +333,11 @@ static NSTouchBarItemIdentifier SliderIdentifier = @"com.electron.touchbar.slide
 - (void)updatePopover:(NSPopoverTouchBarItem*)item
          withSettings:(const mate::PersistentDictionary&)settings {
   std::string label;
-  gfx::Image image;
   if (settings.Get("label", &label)) {
     item.collapsedRepresentationLabel = base::SysUTF8ToNSString(label);
-  } else if (settings.Get("image", &image)) {
+  }
+  gfx::Image image;
+  if (settings.Get("icon", &image)) {
     item.collapsedRepresentationImage = image.AsNSImage();
   }
 

lib/browser/api/touch-bar.js

@@ -174,6 +174,7 @@ TouchBar.Popover = class TouchBarPopover extends TouchBarItem {
     super(config)
     this.type = 'popover'
     this._addLiveProperty('label', config.label)
+    this._addLiveProperty('icon', config.icon)
     this.showCloseButton = config.showCloseButton
     this.child = config.items
     if (!(this.child instanceof TouchBar)) {