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 "base/macros.h"
+#include "base/observer_list.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 SigninViewController : public content::WebContentsDelegate {

[sky, 2015/12/01 21:12:37]

Why do you need this and ModalSigninDelegate to be WebContentsDelegate? AFAICT
you aren't overriding anything from WebContentsDelegate.

[anthonyvd, 2015/12/01 22:25:04]

I don't believe I need it, it's some leftover from when I was moving
CreateGaiaWebView from ProfileChooserController and thought this class would do
more things. Thanks for noticing :) 

+ public:
+  class Observer {
+   public:
+    // Called when the modal signin window should be closed as a result of a
+    // direct or indirect user action, such as when signin is completed or
+    // cancelled.
+    virtual void OnCloseRequested() = 0;
+  };
+
+  SigninViewController();
+  ~SigninViewController() override;
+
+  // Returns true if the signin flow should be shown as tab-modal for |mode|.
+  static bool ShouldShowModalSigninForMode(profiles::BubbleViewMode mode);
+
+  // Creates the web view that contains the signin flow in |mode| using
+  // |profile| as the web content's profile, then sets |delegate| as the created
+  // web content's delegate.
+  static views::WebView* CreateGaiaWebView(WebContentsDelegate* delegate,
+                                           profiles::BubbleViewMode mode,
+                                           Profile* profile);
+
+  // Shows the signin flow as a tab modal dialog attached to |browser|'s active
+  // web contents.
+  void ShowModalSignin(profiles::BubbleViewMode mode, Browser* browser);
+
+  // Closes the tab-modal signin flow previously shown using this
+  // SigninViewController, if one exists. Does nothing otherwise.
+  void CloseModalSignin();
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+ private:
+   base::ObserverList<Observer> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(SigninViewController);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_PROFILES_SIGNIN_VIEW_CONTROLLER_H_