Lock rotation when screen is manually rotated.

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index 96ee265d23b84e862c260c41ea42eceaa55c1b82..0dc9bd169bb98aab2b1c421217600170199b6ac5 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -63,6 +63,7 @@
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_sequence.h"
 #include "ui/compositor/layer_animator.h"
+#include "ui/display/types/display_constants.h"
 #include "ui/events/event.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 #include "ui/gfx/screen.h"
@@ -345,7 +346,8 @@ bool HandleRotateScreen() {
   const DisplayInfo& display_info =
       Shell::GetInstance()->display_manager()->GetDisplayInfo(display.id());
   Shell::GetInstance()->display_manager()->SetDisplayRotation(
-      display.id(), GetNextRotation(display_info.rotation()));
+      display.id(), GetNextRotation(display_info.rotation()),
+      ui::USER);
   return true;
 }