Make the new Gaia password separated signin flow modal.

chrome/browser/ui/views/profiles/signin_view_controller.h

+// Copyright 2015 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.
+
+#ifndef CHROME_BROWSER_UI_VIEWS_PROFILES_SIGNIN_VIEW_CONTROLLER_H_
+#define CHROME_BROWSER_UI_VIEWS_PROFILES_SIGNIN_VIEW_CONTROLLER_H_
+
+#include "chrome/browser/ui/profile_chooser_constants.h"
+#include "content/public/browser/web_contents_delegate.h"
+
+class Browser;
+class Profile;
+
+namespace views {
+class WebView;
+class Widget;
+};
+
+class SigninViewController : public content::WebContentsDelegate {
+ public:
+  SigninViewController() : modal_signin_widget_(nullptr) {}
+  static views::WebView* CreateGaiaWebView(WebContentsDelegate* delegate,
+                                           profiles::BubbleViewMode mode,
+                                           Profile* profile);
+  void ShowModalSignin(profiles::BubbleViewMode mode, Browser* browser);
+  void CloseModalSignin();
+  static bool ShouldShowModalSigninForMode(profiles::BubbleViewMode mode);
+
+ private:
+  views::Widget* modal_signin_widget_;  // Not owned.
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_PROFILES_SIGNIN_VIEW_CONTROLLER_H_