cros: Preload and reuse the lock screen across lock sessions

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index 34bec2b4a485103b07b7b97d6fb8d0210a277ba3..6125cf5568474863a6b215b7a98b7dc3e1af72f0 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -200,6 +200,13 @@ const base::Feature kSecurityChip{"SecurityChip",
                                   base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
+#if defined(OS_CHROMEOS)
+// The lock screen will be preloaded and shared so it is instantly available
+// when the user locks the Chromebook device.
+const base::Feature kSharedLockScreen{"SharedLockScreen",
+                                      base::FEATURE_DISABLED_BY_DEFAULT};
+#endif
+
 // A new user experience for transitioning into fullscreen and mouse pointer
 // lock states.
 const base::Feature kSimplifiedFullscreenUI{"ViewsSimplifiedFullscreenUI",