Visual improvements to text filtering in Ash overview mode

ash/wm/overview/window_selector.h

Index: ash/wm/overview/window_selector.h
diff --git a/ash/wm/overview/window_selector.h b/ash/wm/overview/window_selector.h
index 8eae7e0f356b4cb488937d86994413142c7b4764..678313c4f3a4c35916712b31bdad839020795411 100644
--- a/ash/wm/overview/window_selector.h
+++ b/ash/wm/overview/window_selector.h
@@ -52,6 +52,10 @@ class ASH_EXPORT WindowSelector
       public aura::client::ActivationChangeObserver,
       public views::TextfieldController {
  public:
+  // The distance between the top edge of the screen and the bottom edge of
+  // the text filtering textfield.
+  static const int kTextFilterBottomEdge;
+
   enum Direction {
     LEFT,
     UP,