Add lucid sleep flag and debugging helper

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index efba3b7f09166a68b518777e51772c30bfe1e1ff..2c68645fe238559eabdcaeeff9a03f9a54e51b68 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -87,6 +87,10 @@ const char kEnableEmbeddedSignin[] = "enable-embedded-signin";
 // Enabled sharing assets for installed default apps.
 const char kEnableExtensionAssetsSharing[]  = "enable-extension-assets-sharing";
 
+// Enables experimental features for maintaining persistent network
+// connectivity.
+const char kEnableLucidSleep[] = "enable-lucid-sleep";
+
 // Enables notifications about captive portals in session.
 const char kEnableNetworkPortalNotification[] =
     "enable-network-portal-notification";