MD Settings: Add feature flag for showing content settings in a per-origin view.

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 62ceb69312075a4f361b51de3afbf6535067a6e7..c0dce299d8b3ec227e1354d87d2481668d98e56b 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1206,6 +1206,9 @@ const FeatureEntry kFeatureEntries[] = {
     {"top-chrome-md", flag_descriptions::kTopChromeMd,
      flag_descriptions::kTopChromeMdDescription, kOsDesktop,
      MULTI_VALUE_TYPE(kTopChromeMaterialDesignChoices)},
+    {"enable-site-details", flag_descriptions::kSiteDetails,
+     flag_descriptions::kSiteDetailsDescription, kOsDesktop,
+     SINGLE_VALUE_TYPE(switches::kEnableSiteDetails)},
     {"enable-site-settings", flag_descriptions::kSiteSettings,
      flag_descriptions::kSiteSettingsDescription, kOsDesktop,
      SINGLE_VALUE_TYPE(switches::kEnableSiteSettings)},