[Merge to M58] cros: Treat set rotation for chrome.system.display API in touchview mode as if user …

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 2db2070588d7790266f8d78d63529362d776a34a..d37cb80cbae74d0cf6c362bf0758fd4b01d9bba4 100644
--- a/ash/display/screen_orientation_controller_chromeos.h
+++ b/ash/display/screen_orientation_controller_chromeos.h
@@ -79,6 +79,9 @@ class ASH_EXPORT ScreenOrientationController
   // user rotation lock.
   void ToggleUserRotationLock();
 
+  // Set locked to the given |rotation| and save it.
+  void SetLockToRotation(display::Display::Rotation rotation);
+
   // WmActivationObserver:
   void OnWindowActivated(WmWindow* gained_active,
                          WmWindow* lost_active) override;
@@ -109,6 +112,9 @@ class ASH_EXPORT ScreenOrientationController
 
   void SetRotationLockedInternal(bool rotation_locked);
 
+  // A helper method that set locked to the given |orientation| and save it.
+  void SetLockToOrientation(blink::WebScreenOrientationLockType orientation);
+
   // Sets the display rotation to |rotation|. Future accelerometer updates
   // should not be used to change the rotation. SetRotationLocked(false) removes
   // the rotation lock.