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

ash/wm/dock/docked_window_resizer.cc

Index: ash/wm/dock/docked_window_resizer.cc
diff --git a/ash/wm/dock/docked_window_resizer.cc b/ash/wm/dock/docked_window_resizer.cc
index d0b86f9aed60fe4e2442806684c3b805e8e761b5..79e708877eea27b8d90fd4f109a4e0f436f05c32 100644
--- a/ash/wm/dock/docked_window_resizer.cc
+++ b/ash/wm/dock/docked_window_resizer.cc
@@ -198,12 +198,7 @@ void DockedWindowResizer::StartedDragging() {
       GetTarget()->parent()->id() == kShellWindowId_DefaultContainer) {
     // Reparent the window into the docked windows container in order to get it
     // on top of other docked windows.
-    aura::Window* docked_container = Shell::GetContainer(
-        GetTarget()->GetRootWindow(),
-        kShellWindowId_DockedContainer);
-    wm::ReparentChildWithTransientChildren(GetTarget(),
-                                           GetTarget()->parent(),
-                                           docked_container);
+    wm::DockWindow(GetTarget());
   }
   if (is_docked_)
     dock_layout_->DockDraggedWindow(GetTarget());