[ProtocolHandlers] Add a permission bubble client for RPH requests.

chrome/browser/custom_handlers/protocol_handler_registry.cc

Index: chrome/browser/custom_handlers/protocol_handler_registry.cc
diff --git a/chrome/browser/custom_handlers/protocol_handler_registry.cc b/chrome/browser/custom_handlers/protocol_handler_registry.cc
index dbeda49a088579a2bc60211604999f0137ddae93..733e935d834f1c1791d4216eaf9227b55038828a 100644
--- a/chrome/browser/custom_handlers/protocol_handler_registry.cc
+++ b/chrome/browser/custom_handlers/protocol_handler_registry.cc
@@ -14,6 +14,7 @@
 #include "chrome/browser/custom_handlers/register_protocol_handler_infobar_delegate.h"
 #include "chrome/browser/net/chrome_url_request_context.h"
 #include "chrome/browser/profiles/profile_io_data.h"
+#include "chrome/browser/ui/website_settings/permission_bubble_manager.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/custom_handlers/protocol_handler.h"
 #include "chrome/common/pref_names.h"
@@ -332,6 +333,17 @@ bool ProtocolHandlerRegistry::SilentlyHandleRegisterHandlerRequest(
   return false;
 }
 
+void ProtocolHandlerRegistry::RequestPermission(
+    content::WebContents* web_contents,
+    const ProtocolHandler& handler) {
+  if (PermissionBubbleManager::Enabled()) {
+    return;
+  }
+
+  RegisterProtocolHandlerInfoBarDelegate::Create(
+      InfoBarService::FromWebContents(web_contents), this, handler);
+}
+
 void ProtocolHandlerRegistry::OnAcceptRegisterProtocolHandler(
     const ProtocolHandler& handler) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));