While trying to enable webview sign-in by default, I found a bunch of issues

chrome/browser/ui/webui/signin/inline_login_handler_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/signin/inline_login_handler_impl.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 222 matching lines @@
 
 }  // namespace
 
 InlineLoginHandlerImpl::InlineLoginHandlerImpl()
       : confirm_untrusted_signin_(false),
         weak_factory_(this) {
 }
 
 InlineLoginHandlerImpl::~InlineLoginHandlerImpl() {}
 
+// This method is not called with webview sign in enabled.
 void InlineLoginHandlerImpl::DidCommitProvisionalLoadForFrame(
     content::RenderFrameHost* render_frame_host,
     const GURL& url,
     ui::PageTransition transition_type) {
   if (!web_contents())
     return;
 
   // Returns early if this is not a gaia iframe navigation.
   const GURL kGaiaExtOrigin(
       "chrome-extension://mfffpogegjflfpflabcdkioaeobkgjik/");
@@ skipping 34 matching lines @@
   args->GetDictionary(0, &dict);
 
   bool skip_for_now = false;
   dict->GetBoolean("skipForNow", &skip_for_now);
   if (skip_for_now) {
     signin::SetUserSkippedPromo(Profile::FromWebUI(web_ui()));
     SyncStarterCallback(OneClickSigninSyncStarter::SYNC_SETUP_FAILURE);
     return;
   }
 
+  // This value exists only for webview sign in.
+  bool trusted = false;
+  if (dict->GetBoolean("trusted", &trusted))
+    confirm_untrusted_signin_ = !trusted;
+
   base::string16 email_string16;
   dict->GetString("email", &email_string16);
   DCHECK(!email_string16.empty());
   std::string email(base::UTF16ToASCII(email_string16));
 
   base::string16 password_string16;
   dict->GetString("password", &password_string16);
   std::string password(base::UTF16ToASCII(password_string16));
 
   base::string16 gaia_id_string16;
@@ skipping 144 matching lines @@
       }
     }
 
     if (show_account_management) {
       browser->window()->ShowAvatarBubbleFromAvatarButton(
             BrowserWindow::AVATAR_BUBBLE_MODE_ACCOUNT_MANAGEMENT,
             signin::ManageAccountsParams());
     }
   }
 }