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

ash/wm/wm_event.h

Index: ash/wm/wm_event.h
diff --git a/ash/wm/wm_event.h b/ash/wm/wm_event.h
index c4fade4e4c562497e5bc36b18e3d9df87fcc85c8..ad64a21196a8ae0a6782984df6cc065b470afa3f 100644
--- a/ash/wm/wm_event.h
+++ b/ash/wm/wm_event.h
@@ -54,6 +54,19 @@ enum WMEventType {
   // A user requested to toggle fullscreen state.
   WM_EVENT_TOGGLE_FULLSCREEN,
 
+  // A user requested a cycle of dock and snap left.
+  // The way this event is processed is the current window state is used as
+  // the starting state. Assuming normal window start state; if the window can
+  // be snapped left, snap it; otherwise progress to next state. If the window
+  // can be docked left, dock it; otherwise progress to next state. If the
+  // window can be restored; and this isn't the entry condition restore it;
+  // otherwise apply the bounce animation to the window.
+  WM_EVENT_CYCLE_SNAP_DOCK_LEFT,
+
+  // A user requested a cycle of dock and snap right.
+  // See decription of WM_EVENT_CYCLE_SNAP_DOCK_LEFT.
+  WM_EVENT_CYCLE_SNAP_DOCK_RIGHT,
+
   // A user requested to center a window.
   WM_EVENT_CENTER,