Add policy indicator for protocol handlers

chrome/browser/custom_handlers/protocol_handler_registry.h

Index: chrome/browser/custom_handlers/protocol_handler_registry.h
diff --git a/chrome/browser/custom_handlers/protocol_handler_registry.h b/chrome/browser/custom_handlers/protocol_handler_registry.h
index 724c591f13e568db1badc8b4bac6357693ac9ab5..d35974464d965dcdaafa5dcec914c1f52189c04a 100644
--- a/chrome/browser/custom_handlers/protocol_handler_registry.h
+++ b/chrome/browser/custom_handlers/protocol_handler_registry.h
@@ -201,6 +201,10 @@ class ProtocolHandlerRegistry : public KeyedService {
   // Returns true if an identical protocol handler has already been registered.
   bool IsRegistered(const ProtocolHandler& handler) const;
 
+  // Returns true if an identical protocol handler has already been registered
+  // by user.
+  bool IsRegisteredByUser(const ProtocolHandler& handler);
+
   // Returns true if an identical protocol handler is being ignored.
   bool IsIgnored(const ProtocolHandler& handler) const;