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

ash/wm/workspace/workspace_layout_manager.cc

Index: ash/wm/workspace/workspace_layout_manager.cc
diff --git a/ash/wm/workspace/workspace_layout_manager.cc b/ash/wm/workspace/workspace_layout_manager.cc
index 63c4aed0e71112d817c63f2d2bd71d113efe85f6..6fc12eb80b5292662c8dd63d8871343e70f8425a 100644
--- a/ash/wm/workspace/workspace_layout_manager.cc
+++ b/ash/wm/workspace/workspace_layout_manager.cc
@@ -264,6 +264,11 @@ void WorkspaceLayoutManager::OnPostWindowStateTypeChange(
     wm::WindowState* window_state,
     wm::WindowStateType old_type) {
 
+  aura::Window* window = window_state->window();
+  if (window_state->IsDocked()) {
+    wm::DockWindow(window);
+  }
+
   // Notify observers that fullscreen state may be changing.
   if (window_state->IsFullscreen() ||
       old_type == wm::WINDOW_STATE_TYPE_FULLSCREEN) {