Add Easy Unlock options to chrome://settings behind a flag.

chrome/browser/ui/webui/options/browser_options_handler.h

Index: chrome/browser/ui/webui/options/browser_options_handler.h
diff --git a/chrome/browser/ui/webui/options/browser_options_handler.h b/chrome/browser/ui/webui/options/browser_options_handler.h
index ca9cd371572929e76668f0e56fa6d21a8643a728..fe967e7c655b0faa167c001e57f8abf737e8b7c9 100644
--- a/chrome/browser/ui/webui/options/browser_options_handler.h
+++ b/chrome/browser/ui/webui/options/browser_options_handler.h
@@ -266,6 +266,9 @@ class BrowserOptionsHandler
   // Callback for "requestHotwordAvailable" message.
   void HandleRequestHotwordAvailable(const base::ListValue* args);
 
+  // Callback for "launchEasyUnlockSetup" message.
+  void HandleLaunchEasyUnlockSetup(const base::ListValue* args);
+
 #if defined(OS_CHROMEOS)
   // Opens the wallpaper manager component extension.
   void HandleOpenWallpaperManager(const base::ListValue* args);
@@ -301,6 +304,9 @@ class BrowserOptionsHandler
   // Setup the UI specific to managing supervised users.
   void SetupManagingSupervisedUsers();
 
+  // Setup the UI for Easy Unlock.
+  void SetupEasyUnlock();
+
 #if defined(OS_CHROMEOS)
   // Setup the accessibility features for ChromeOS.
   void SetupAccessibilityFeatures();