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..4d7a36dbc3c0b7c2c24d7fb19f6cbdc4b6d6356b 100644
--- a/ash/wm/workspace/workspace_layout_manager.cc
+++ b/ash/wm/workspace/workspace_layout_manager.cc
@@ -264,6 +264,9 @@ void WorkspaceLayoutManager::OnPostWindowStateTypeChange(
     wm::WindowState* window_state,
     wm::WindowStateType old_type) {
 
+  if (window_state->IsDocked())
+    wm::DockWindow(window_state->window());
+
   // Notify observers that fullscreen state may be changing.
   if (window_state->IsFullscreen() ||
       old_type == wm::WINDOW_STATE_TYPE_FULLSCREEN) {