Change behaviour of the Alt-] and Alt-[ keys so that it cycles through SnapLeft/SnapRight to DockLe…

ash/wm/workspace/workspace_layout_manager.h

Index: ash/wm/workspace/workspace_layout_manager.h
diff --git a/ash/wm/workspace/workspace_layout_manager.h b/ash/wm/workspace/workspace_layout_manager.h
index 598276e72446cf45e09f79d5e584825357c3f776..4f026e31a27bb1f9232e49fa3635c7626709dd29 100644
--- a/ash/wm/workspace/workspace_layout_manager.h
+++ b/ash/wm/workspace/workspace_layout_manager.h
@@ -91,6 +91,10 @@ class ASH_EXPORT WorkspaceLayoutManager
   virtual void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) OVERRIDE;
 
   // WindowStateObserver overrides:
+  virtual void OnPreWindowStateTypeChange(
+      wm::WindowState* window_state,
+      wm::WindowStateType old_type) OVERRIDE;
+
   virtual void OnPostWindowStateTypeChange(
       wm::WindowState* window_state,
       wm::WindowStateType old_type) OVERRIDE;