Expose the MacViewsWebUIDialogs feature flag to chrome://flags

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 61d12bc6e1d1466f2e4b915cbb0adb6dca7e454e..4e6f52f4522dfa988f075f9bdb94c3865a819782 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -91,6 +91,10 @@
 #include "components/search_engines/desktop_search_utils.h"
 #endif  // defined(OS_WIN)
 
+#if defined(OS_MACOSX)
+#include "chrome/browser/ui/browser_dialogs.h"
+#endif
+
 #if defined(ENABLE_APP_LIST)
 #include "ui/app_list/app_list_switches.h"
 #endif
@@ -1563,9 +1567,12 @@ const FeatureEntry kFeatureEntries[] = {
      IDS_FLAGS_APP_WINDOW_CYCLING_DESCRIPTION, kOsMac,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAppWindowCycling,
                                switches::kDisableAppWindowCycling)},
-    {"mac-views-dialogs", IDS_FLAGS_MAC_VIEWS_DIALOGS_NAME,
+    {"mac-views-dialogs-phase3", IDS_FLAGS_MAC_VIEWS_DIALOGS_NAME,
      IDS_FLAGS_MAC_VIEWS_DIALOGS_DESCRIPTION, kOsMac,
      SINGLE_VALUE_TYPE(switches::kEnableMacViewsDialogs)},
+    {"mac-views-dialogs-phase2", IDS_FLAGS_MAC_VIEWS_DIALOGS_PHASE2_NAME,
+     IDS_FLAGS_MAC_VIEWS_DIALOGS_PHASE2_DESCRIPTION, kOsMac,
+     FEATURE_VALUE_TYPE(chrome::kMacViewsWebUIDialogs)},
 #endif
 #if defined(ENABLE_WEBVR)
     {"enable-webvr", IDS_FLAGS_WEBVR_NAME, IDS_FLAGS_WEBVR_DESCRIPTION, kOsAll,