Overscan calibration UI.

ash/display/display_controller.cc

Index: ash/display/display_controller.cc
diff --git a/ash/display/display_controller.cc b/ash/display/display_controller.cc
index b023cd9c5f7de846766d8158c8f3e560d0f3db00..c07841227390da9004b8dd51e2481b161031de2e 100644
--- a/ash/display/display_controller.cc
+++ b/ash/display/display_controller.cc
@@ -284,6 +284,10 @@ std::vector<aura::RootWindow*> DisplayController::GetAllRootWindows() {
   return windows;
 }
 
+gfx::Insets DisplayController::GetOverscanInsets(int64 display_id) const {
+  return GetDisplayManager()->GetOverscanInsets(display_id);
+}
+
 std::vector<internal::RootWindowController*>
 DisplayController::GetAllRootWindowControllers() {
   std::vector<internal::RootWindowController*> controllers;