Add lucid sleep flag and debugging helper

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index f580293bd7131da141afa3ca3b27ad413392a4fe..cd98c429c0c786f64f17c77fb03ae157337ae710 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1898,6 +1898,15 @@ const Experiment kExperiments[] = {
         switches::kEnableMessageCenterAlwaysScrollUpUponNotificationRemoval)
   },
 #endif
+#if defined(OS_CHROMEOS)
+  {
+    "enable-lucid-sleep",
+    IDS_FLAGS_ENABLE_LUCID_SLEEP_NAME,
+    IDS_FLAGS_ENABLE_LUCID_SLEEP_DESCRIPTION,
+    kOsCrOS,
+    SINGLE_VALUE_TYPE(chromeos::switches::kEnableLucidSleep)
+  },
+#endif  // OS_CHROMEOS
   // NOTE: Adding new command-line switches requires adding corresponding
   // entries to enum "LoginCustomFlags" in histograms.xml. See note in
   // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.