Add window states docked; and docked minimized. Add wm window event to set docked and undocked.

ash/wm/dock/docked_window_layout_manager.h

Index: ash/wm/dock/docked_window_layout_manager.h
diff --git a/ash/wm/dock/docked_window_layout_manager.h b/ash/wm/dock/docked_window_layout_manager.h
index 51b302ec3cf0bfeab47e1605d50dc4e2a953afd5..214a7a19da5a810842ca0097f9068813646641aa 100644
--- a/ash/wm/dock/docked_window_layout_manager.h
+++ b/ash/wm/dock/docked_window_layout_manager.h
@@ -107,6 +107,8 @@ class ASH_EXPORT DockedWindowLayoutManager
   // Records |action| by |source| in UMA.
   void FinishDragging(DockedAction action, DockedActionSource source);
 
+  void SetDockedAlignment(DockedAlignment desired_alignment);

[varkha, 2014/09/29 18:59:28]

nit: Not sure if Set is the right name here since this is not a simple setter.
Also needs a comment describing the parameter(s).

[dtapuska, 2014/09/29 20:59:57]

Done.

+
   Shelf* shelf() { return shelf_; }
   void SetShelf(Shelf* shelf);
 
@@ -183,6 +185,8 @@ class ASH_EXPORT DockedWindowLayoutManager
   // Ideal (starting) width of the dock.
   static const int kIdealWidth;
 
+  DockedAlignment CalculateAlignment(const aura::Window* query_window) const;

[varkha, 2014/09/29 18:59:28]

CalculateAlignment name is already used and is public. I would make the name
explicit, maybe CalculateAlignmentOfWindow(window) and change the parameter to
just |window|. Also needs a comment explaining what it returns and the
parameter(s).

[dtapuska, 2014/09/29 20:59:57]

Done.

+
   // Keep at most kMaxVisibleWindows visible in the dock and minimize the rest
   // (except for |child|).
   void MaybeMinimizeChildrenExcept(aura::Window* child);