Rotate screen in response to accelerator or device orientation sensors.

ui/aura/test/test_screen.h

Index: ui/aura/test/test_screen.h
diff --git a/ui/aura/test/test_screen.h b/ui/aura/test/test_screen.h
index 2eefaaefbe3dadb0d8075b2cb954d8bad5d2b7df..41421dd21f35a8c08b56421270964cc1c6260953 100644
--- a/ui/aura/test/test_screen.h
+++ b/ui/aura/test/test_screen.h
@@ -6,6 +6,7 @@
 #define UI_AURA_TEST_TEST_SCREEN_H_
 
 #include "base/compiler_specific.h"
+#include "ui/aura/aura_export.h"
 #include "ui/aura/window_observer.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
@@ -20,8 +21,8 @@ class Window;
 class WindowTreeHost;
 
 // A minimal, testing Aura implementation of gfx::Screen.
-class TestScreen : public gfx::Screen,
-                   public WindowObserver {
+class AURA_EXPORT TestScreen : public gfx::Screen,
+                               public WindowObserver {
  public:
   // Creates a gfx::Screen of the specified size. If no size is specified, then
   // creates a 800x600 screen. |size| is in physical pixels.