Fix system tray focus on locked state screen

ash/common/system/tray/tray_background_view.cc

Index: ash/common/system/tray/tray_background_view.cc
diff --git a/ash/common/system/tray/tray_background_view.cc b/ash/common/system/tray/tray_background_view.cc
index 0e0a149d585fd86a113c79650020c7f6d57dbbaf..9866a1c9472ffc14016cb27541f607513e0a2bdc 100644
--- a/ash/common/system/tray/tray_background_view.cc
+++ b/ash/common/system/tray/tray_background_view.cc
@@ -542,6 +542,7 @@ void TrayBackgroundView::OnPaint(gfx::Canvas* canvas) {
       shelf()->GetBackgroundType() ==
           ShelfBackgroundType::SHELF_BACKGROUND_DEFAULT ||
       !is_separator_visible_) {
+    ActionableView::OnPaint(canvas);

[tdanderson, 2016/08/24 16:20:17]

You should be able to just have a single call to the superclass at the top of
this function (immediately before line 541). Can you try that and verify it does
what you expect?

     return;
   }
   // In the given |canvas|, draws a 1x32px separator line 4 pixel to the right
@@ -565,6 +566,7 @@ void TrayBackgroundView::OnPaint(gfx::Canvas* canvas) {
   gfx::RectF rect(gfx::ScaleRect(gfx::RectF(bounds), scale));
   canvas->DrawLine(horizontal_shelf ? rect.top_right() : rect.bottom_left(),
                    rect.bottom_right(), paint);
+  ActionableView::OnPaint(canvas);
 }
 
 }  // namespace ash