Observes work area change and auto-hide for notifications.

ash/shelf/shelf_layout_manager.cc

Index: ash/shelf/shelf_layout_manager.cc
diff --git a/ash/shelf/shelf_layout_manager.cc b/ash/shelf/shelf_layout_manager.cc
index fec998ba28f5f0cbdb27de5fbb94de4bf84bfe45..18bc4449f9985876bbf914abca2135b77b577649 100644
--- a/ash/shelf/shelf_layout_manager.cc
+++ b/ash/shelf/shelf_layout_manager.cc
@@ -70,11 +70,6 @@ bool IsDraggingTrayEnabled() {
   return dragging_tray_allowed;
 }
 
-int GetPreferredShelfSize() {
-  return ash::switches::UseAlternateShelfLayout() ?
-      ShelfLayoutManager::kShelfSize : kLauncherPreferredSize;
-}
-
 }  // namespace
 
 // static
@@ -89,6 +84,11 @@ const int ShelfLayoutManager::kAutoHideSize = 3;
 // static
 const int ShelfLayoutManager::kShelfSize = 47;
 
+int ShelfLayoutManager::GetPreferredShelfSize() {
+  return ash::switches::UseAlternateShelfLayout() ?
+      ShelfLayoutManager::kShelfSize : kLauncherPreferredSize;
+}
+
 // ShelfLayoutManager::AutoHideEventFilter -------------------------------------
 
 // Notifies ShelfLayoutManager any time the mouse moves.