Add storage manager overlay on Settings.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index 1b53b2c6b1a28407c3451046c0f26fd46f129ddc..811776c4fc7c302c3a4f1b7ea7cc05c809fb59af 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -174,6 +174,9 @@ const char kEnableTouchpadThreeFingerClick[]
 const char kEnableScreenshotTestingWithMode[] =
     "enable-screenshot-testing-with-mode";
 
+// Enables experimental storage manager to manage local storage.
+const char kEnableStorageManager[] = "enable-storage-manager";
+
 // Enable Kiosk mode for ChromeOS. Note this switch refers to retail mode rather
 // than the kiosk app mode.
 const char kEnableKioskMode[] = "enable-kiosk-mode";