Moves FindDisplayIndexContainingPoint into display

ui/display/screen_base.cc

Index: ui/display/screen_base.cc
diff --git a/ui/display/screen_base.cc b/ui/display/screen_base.cc
index 21c8c270f2c21cbf3d29c3f9ef696dceb51e5fd3..297f9108958d827bb1a1c6e3c142e4092c75037d 100644
--- a/ui/display/screen_base.cc
+++ b/ui/display/screen_base.cc
@@ -58,6 +58,9 @@ const std::vector<Display>& ScreenBase::GetAllDisplays() const {
 }
 
 Display ScreenBase::GetDisplayMatching(const gfx::Rect& match_rect) const {
+  if (match_rect.IsEmpty())
+    return GetDisplayNearestPoint(match_rect.origin());
+
   const Display* match =
       FindDisplayWithBiggestIntersection(display_list_.displays(), match_rect);
   return match ? *match : GetPrimaryDisplay();