Add GetDisplayWithDisplayId to display::Screen.

ui/aura/test/test_screen.cc

Index: ui/aura/test/test_screen.cc
diff --git a/ui/aura/test/test_screen.cc b/ui/aura/test/test_screen.cc
index f19137c6dc5e3e675e1171ab4c42aa24dda6b905..9186f9f1beeab98ba5e3b0faf9c24895f2214fda 100644
--- a/ui/aura/test/test_screen.cc
+++ b/ui/aura/test/test_screen.cc
@@ -148,6 +148,15 @@ std::vector<display::Display> TestScreen::GetAllDisplays() const {
   return std::vector<display::Display>(1, display_);
 }
 
+bool TestScreen::GetDisplayWithDisplayId(int64_t display_id,
+                                         display::Display* display) const {
+  if (display_.id() == display_id) {
+    *display = display_;
+    return true;
+  }
+  return false;
+}
+
 display::Display TestScreen::GetDisplayNearestWindow(
     gfx::NativeWindow window) const {
   return display_;