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

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index a7a89ef110fcc4cfb195002e266977ce98569062..a6c2122fb88bbe36c5e83453555fe13f6079825b 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -409,6 +409,9 @@ const char kEnableQuic[] = "enable-quic";
 // (see SettingsWindowEnabled() below).
 const char kEnableSettingsWindow[]           = "enable-settings-window";
 
+// Enables site details pages in the Chrome settings UI.
+const char kEnableSiteDetails[] = "enable-site-details";
+
 // Enable the Site Engagement Eviction Policy which evicts temporary storage
 // using the site engagement service. Implicitly enables the site engagement
 // service.