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 3c6c4466ef925fa3ca03e33d5b9f247d16705ae2..092c2f26ded8dc34856d0cda5eda2b8f6e75a6a1 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -194,6 +194,13 @@ const base::Feature kRunAllFlashInAllowMode{"RunAllFlashInAllowMode",
 const base::Feature kSafeSearchUrlReporting{"SafeSearchUrlReporting",
                                             base::FEATURE_DISABLED_BY_DEFAULT};
 
+#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",