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

ash/wm/window_util.h

Index: ash/wm/window_util.h
diff --git a/ash/wm/window_util.h b/ash/wm/window_util.h
index aafb7f39e841e4975881746932292b2a30647a55..10321e211c589a6af6f2824bba396cffe46acdfa 100644
--- a/ash/wm/window_util.h
+++ b/ash/wm/window_util.h
@@ -108,6 +108,9 @@ ASH_EXPORT void SetSnapsChildrenToPhysicalPixelBoundary(
 // Traverse the |container| tree and installs SnapToPixelLayoutManager.
 void InstallSnapLayoutManagerToContainers(aura::Window* container);
 
+// Docks the |window| by reparenting it to the docked container.
+void DockWindow(aura::Window* window);
+
 }  // namespace wm
 }  // namespace ash