Disable screen rotation when splitview is engaged and only allow splitview in landscape.

athena/screen/public/screen_manager.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ATHENA_SCREEN_PUBLIC_SCREEN_MANAGER_H_
 #define ATHENA_SCREEN_PUBLIC_SCREEN_MANAGER_H_
 
 #include <string>
 
 #include "athena/athena_export.h"
@@ skipping 49 matching lines @@
   // Creates the container window on the screen.
   virtual aura::Window* CreateContainer(const ContainerParams& params) = 0;
 
   // Return the context object to be used for widget creation.
   virtual aura::Window* GetContext() = 0;
 
   // Set screen rotation.
   // TODO(flackr): Extract and use ash DisplayManager to set rotation
   // instead: http://crbug.com/401044.
   virtual void SetRotation(gfx::Display::Rotation rotation) = 0;
+  virtual void SetRotationLocked(bool rotation_locked) = 0;
 
   // Returns the LayerAnimator to use to animate the entire screen (e.g. fade
   // screen to white).
   virtual ui::LayerAnimator* GetScreenAnimator() = 0;
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_SCREEN_PUBLIC_SCREEN_MANAGER_H_