[MD] Implement incognito colors as a NativeTheme (for Aura).

chrome/browser/ui/views/location_bar/icon_label_bubble_view.cc

Index: chrome/browser/ui/views/location_bar/icon_label_bubble_view.cc
diff --git a/chrome/browser/ui/views/location_bar/icon_label_bubble_view.cc b/chrome/browser/ui/views/location_bar/icon_label_bubble_view.cc
index 41462f95fd1ee61b76a8106b42b5cbb4d7f64498..f6a1d472cd322f17b5624c34bfb4c41aacb2e132 100644
--- a/chrome/browser/ui/views/location_bar/icon_label_bubble_view.cc
+++ b/chrome/browser/ui/views/location_bar/icon_label_bubble_view.cc
@@ -121,8 +121,12 @@ void IconLabelBubbleView::OnNativeThemeChanged(
     return;
 
   label_->SetEnabledColor(GetTextColor());
-  SkColor border_color = GetBorderColor();
-  SkColor background_color = SkColorSetA(border_color, 0x13);
+
+  bool inverted =
+      color_utils::GetLuminanceForColor(parent_background_color_) < 128;
+  SkColor border_color = inverted ? SK_ColorWHITE : GetBorderColor();
+  SkColor background_color =
+      inverted ? SK_ColorWHITE : SkColorSetA(border_color, 0x13);
   set_background(
       new BackgroundWith1PxBorder(background_color, border_color, false));
   SetLabelBackgroundColor(background_color);