[Aura] Implement views-based applist.

ui/aura_shell/aura_shell_switches.cc

Index: ui/aura_shell/aura_shell_switches.cc
diff --git a/ui/aura_shell/aura_shell_switches.cc b/ui/aura_shell/aura_shell_switches.cc
index aee6bf386e870f375153ae5d2a23945a30614e56..6c6e728c04f1e634cdccd73fa3fed08f1d2ea051 100644
--- a/ui/aura_shell/aura_shell_switches.cc
+++ b/ui/aura_shell/aura_shell_switches.cc
@@ -17,6 +17,9 @@ const char kAuraNoShadows[] = "aura-no-shadows";
 // Use Aura-style translucent window frame.
 const char kAuraTranslucentFrames[] = "aura-translucent-frames";
 
+// Use views-based app list.
+const char kAuraViewsAppList[] = "aura-views-applist";
+
 // Use a custom window style, e.g. --aura-window-mode=compact.
 // When this flag is not passed we default to "normal" mode.
 const char kAuraWindowMode[] = "aura-window-mode";