Expand and split DisplayController mojom.

services/ui/public/interfaces/display/display_controller.mojom

 // Copyright 2016 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.
 
 module display.mojom;
 
+import "ui/gfx/geometry/mojo/geometry.mojom";
+
 // An interface for clients that are allowed to make changes to the display 
 // state.
 interface DisplayController {
-  // Toggles adding or removing a virtual display. If there is only one display
-  // a second display is added. If there is more than one display then the last
-  // display is removed. 
-  ToggleVirtualDisplay();
+
+  // Swap the primary display and the next display.
+  SwapPrimaryDisplay();
+
+  // Sets the display work area with the provided insets. The display size is
+  // included to ensure that the insets are for the current display size.
+  SetDisplayWorkArea(int64 display_id, 
+                     gfx.mojom.Size size,
+                     gfx.mojom.Insets insets);
 
   // TODO(kylechar): This interface will need to be expanded to provide
   // additional functionality for the display settings page and other ash
   // keyboard accelerators.
 };