cros: Treat set rotation for chrome.system.display API in touchview mode as if user rotation lock

ash/display/screen_orientation_controller_chromeos.h

Index: ash/display/screen_orientation_controller_chromeos.h
diff --git a/ash/display/screen_orientation_controller_chromeos.h b/ash/display/screen_orientation_controller_chromeos.h
index 069d5177930178938e58920975fd900ae3edb449..1fd12300289a4d3e0fa0a9615fbb6da9f3ebf20f 100644
--- a/ash/display/screen_orientation_controller_chromeos.h
+++ b/ash/display/screen_orientation_controller_chromeos.h
@@ -46,6 +46,9 @@ class ASH_EXPORT ScreenOrientationController
   ScreenOrientationController();
   ~ScreenOrientationController() override;
 
+  static blink::WebScreenOrientationLockType RotationToOrientation(
+      display::Display::Rotation rotation);
+
   // Add/Remove observers.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
@@ -79,6 +82,9 @@ class ASH_EXPORT ScreenOrientationController
   // user rotation lock.
   void ToggleUserRotationLock();
 
+  // Set Locked to the given |orientation|.

[oshima, 2017/03/30 00:44:37]

mention that this will be saved

[Qiang(Joe) Xu, 2017/03/30 01:15:14]

Done.

+  void SetLockToOrientation(blink::WebScreenOrientationLockType orientation);

[oshima, 2017/03/30 00:44:37]

can you just take the rotation, and do conversion in cc?

[Qiang(Joe) Xu, 2017/03/30 01:15:14]

Done.

+
   // aura::client::ActivationChangeObserver:
   void OnWindowActivated(ActivationReason reason,
                          aura::Window* gained_active,