[Signin] Factor out a helper class to load a continue URL once Sync is configured.

chrome/browser/ui/sync/one_click_signin_sync_observer.h

+// Copyright 2014 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_SYNC_ONE_CLICK_SIGNIN_SYNC_OBSERVER_H_
+#define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_OBSERVER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/sync/profile_sync_service_observer.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "url/gurl.h"
+
+class ProfileSyncService;
+
+namespace content {
+class WebContents;
+}
+
+class OneClickSigninSyncObserver : public content::WebContentsObserver,
+                                   public ProfileSyncServiceObserver {
+ public:
+  // Waits for Sync to be initialized, then navigates the |web_contents| to the
+  // |continue_url|.  Instances of this class delete themselves once the job is
+  // done.
+  OneClickSigninSyncObserver(content::WebContents* web_contents,
+                             const GURL& continue_url);
+
+ protected:
+  // Exposed for testing.
+  virtual ~OneClickSigninSyncObserver();
+
+ private:
+  // content::WebContentsObserver:
+  virtual void WebContentsDestroyed(content::WebContents* contents) OVERRIDE;
+
+  // ProfileSyncServiceObserver:
+  virtual void OnStateChanged() OVERRIDE;
+
+  // Loads the |continue_url_| in the |web_contents()|.
+  void LoadContinueUrl();
+
+  // Returns the ProfileSyncService associated with the |web_contents|.
+  // The returned value may be NULL.
+  ProfileSyncService* GetSyncService(content::WebContents* web_contents);
+
+  // Deletes the |observer|. Intended to be used as a callback for base::Bind.
+  static void DeleteObserver(
+      base::WeakPtr<OneClickSigninSyncObserver> observer);
+
+  // The URL to redirect to once Sync is initialized.
+  const GURL continue_url_;
+
+  base::WeakPtrFactory<OneClickSigninSyncObserver> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(OneClickSigninSyncObserver);
+};
+
+#endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_OBSERVER_H_