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 bcca56714710f2a06ed4d149eb50bae9e5887e8e..250af9cefca57c80461084a8c17387354379575a 100644
--- a/chrome/browser/ui/webui/options/browser_options_handler.h
+++ b/chrome/browser/ui/webui/options/browser_options_handler.h
@@ -278,6 +278,9 @@ class BrowserOptionsHandler
   // Callback for "requestHotwordSetupRetry" message.
   void HandleRequestHotwordSetupRetry(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);
@@ -313,6 +316,9 @@ 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();