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..eef01743a81eda73b0bab5dfcfeb456077981afa 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());
@@ -270,15 +265,11 @@ DockedAction DockedWindowResizer::MaybeReparentWindowOnDragCompletion(
 
   // Check if the window needs to be docked or returned to workspace.
   DockedAction action = DOCKED_ACTION_NONE;
-  aura::Window* dock_container = Shell::GetContainer(
-      window->GetRootWindow(),
-      kShellWindowId_DockedContainer);
   if ((is_resized || !is_attached_panel) &&
-      is_docked_ != (window->parent() == dock_container)) {
+      is_docked_ != (window->parent()->id() ==
+          kShellWindowId_DockedContainer)) {
     if (is_docked_) {
-      wm::ReparentChildWithTransientChildren(window,
-                                             window->parent(),
-                                             dock_container);
+      wm::DockWindow(window);
       action = DOCKED_ACTION_DOCK;
     } else if (window->parent()->id() == kShellWindowId_DockedContainer) {
       // Reparent the window back to workspace.