[MD Settings] Add feature to enable md-settings by default.

chrome/browser/profiles/profile_window.cc

Index: chrome/browser/profiles/profile_window.cc
diff --git a/chrome/browser/profiles/profile_window.cc b/chrome/browser/profiles/profile_window.cc
index 9ed0f49bb4aa0aa942a5305a1907ce8a0b20609a..4dfe963abfb4568348eb39540bee2d53cf41d334 100644
--- a/chrome/browser/profiles/profile_window.cc
+++ b/chrome/browser/profiles/profile_window.cc
@@ -32,6 +32,7 @@
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/profile_chooser_constants.h"
 #include "chrome/browser/ui/user_manager.h"
+#include "chrome/common/chrome_features.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "components/browser_sync/browser/profile_sync_service.h"
@@ -132,9 +133,15 @@ void OnUserManagerSystemProfileCreated(
   if (status != Profile::CREATE_STATUS_INITIALIZED || callback.is_null())
     return;
 
+  // Force Material Design user manager on when Material Design settings are on.
+  bool useMaterialDesignUserManager =

[Dan Beam, 2016/06/07 00:25:08]

use_material_design_user_manager

this is not cocoa or js ;)

also, super optional nit: i think use_md_user_manager would probably be equally
explanatory and more succinct

[groby-ooo-7-16, 2016/06/09 00:18:24]

Done.

+      switches::IsMaterialDesignUserManager() ||
+      base::FeatureList::IsEnabled(features::kMaterialDesignSettingsFeature);
+
   // Tell the webui which user should be focused.
-  std::string page = switches::IsMaterialDesignUserManager() ?
-      chrome::kChromeUIMdUserManagerUrl : chrome::kChromeUIUserManagerURL;
+  std::string page = useMaterialDesignUserManager
+                         ? chrome::kChromeUIMdUserManagerUrl
+                         : chrome::kChromeUIUserManagerURL;
 
   if (tutorial_mode == profiles::USER_MANAGER_TUTORIAL_OVERVIEW) {
     page += profiles::kUserManagerDisplayTutorial;