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

ash/wm/window_util.cc

Index: ash/wm/window_util.cc
diff --git a/ash/wm/window_util.cc b/ash/wm/window_util.cc
index cd39d9c846664480a4e3cb605f7fb31fc2d51b15..0581a96a4b23f480207e1660c13552c031d1fdef 100644
--- a/ash/wm/window_util.cc
+++ b/ash/wm/window_util.cc
@@ -9,6 +9,7 @@
 #include "ash/ash_constants.h"
 #include "ash/screen_util.h"
 #include "ash/shell.h"
+#include "ash/shell_window_ids.h"
 #include "ash/snap_to_pixel_layout_manager.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_state.h"
@@ -206,5 +207,14 @@ void InstallSnapLayoutManagerToContainers(aura::Window* parent) {
   }
 }
 
+void DockWindow(aura::Window* window) {
+  aura::Window* docked_container = Shell::GetContainer(
+    window->GetRootWindow(),
+    kShellWindowId_DockedContainer);
+  wm::ReparentChildWithTransientChildren(window,
+    window->parent(),
+    docked_container);
+}
+
 }  // namespace wm
 }  // namespace ash