Move shelf/launcher/status_area_widget/panel_layout_manager to RootWindowController

ash/ash_switches.cc

Index: ash/ash_switches.cc
diff --git a/ash/ash_switches.cc b/ash/ash_switches.cc
index 4fd6389e6f4da4202831156a3036189ff117d376..a61dab20da08a50dd84f8f6f6a9c0e46df659467 100644
--- a/ash/ash_switches.cc
+++ b/ash/ash_switches.cc
@@ -34,6 +34,9 @@ const char kAshEnableOak[] = "ash-enable-oak";
 // Enables showing the tray bubble by dragging on the shelf.
 const char kAshEnableTrayDragging[] = "ash-enable-tray-dragging";
 
+// Enables creating a launcher per display.
+const char kAshLauncherPerDisplay[] = "ash-launcher-per-display";
+
 // Specifies the layout mode and offsets for the secondary display for
 // testing. The format is "<t|r|b|l>,<offset>" where t=TOP, r=RIGHT,
 // b=BOTTOM and L=LEFT. For example, 'r,-100' means the secondary display