Minimize black screen during the boot with multi displays

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index d50bbe9cb3fb8d491a43e05e6ad1db34a9ea9080..67ab213320f96b239de97e6a034ebebfda191bf1 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -6,6 +6,7 @@
 
 #include <vector>
 
+#include "ash/ash_constants.h"
 #include "ash/ash_switches.h"
 #include "ash/desktop_background/desktop_background_widget_controller.h"
 #include "ash/display/display_controller.h"
@@ -56,11 +57,6 @@
 namespace ash {
 namespace {
 
-#if defined(OS_CHROMEOS)
-// Background color used for the Chrome OS boot splash screen.
-const SkColor kChromeOsBootColor = SkColorSetARGB(0xff, 0xfe, 0xfe, 0xfe);
-#endif
-
 // Duration for the animation that hides the boot splash screen, in
 // milliseconds.  This should be short enough in relation to
 // wm/window_animation.cc's brightness/grayscale fade animation that the login