Implement one click login.

chrome/browser/ui/sync/one_click_signin_helper.h

+// Copyright (c) 2012 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_HELPER_H_
+#define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_
+#pragma once
+
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace net {
+class URLRequest;
+}
+
+// Per-tab one-click signin helper.  When a user signs in to a Google service
+// and the profile is not yet connected to a Google account, will start the
+// process of helping the user connect his profile with one click.  The process
+// begins with an infobar and is followed with a confirmation dialog explaining
+// more about what this means.
+class OneClickSigninHelper : public content::WebContentsObserver {
+ public:
+  // Returns true if the one-click signin feature can be offered at this time.
+  // It can be offered if the contents is not in an incognito window.
+  static bool CanOffer(content::WebContents* web_contents);
+
+  // Looks for the X-Google-Accounts-SignIn response header, and if found,
+  // tries to display an infobar in the tab contents identified by the
+  // child/route id.
+  static void ShowInfoBarIfPossible(net::URLRequest* request,
+                                    int child_id,
+                                    int route_id);
+
+  explicit OneClickSigninHelper(content::WebContents* web_contents);
+  ~OneClickSigninHelper();
+
+ private:
+  // The portion of ShowInfoBarIfPossible() that needs to run on the UI thread.
+  static void ShowInfoBarUIThread(const std::string& account,
+                                  int child_id,
+                                  int route_id);
+
+  // content::WebContentsObserver overrides.
+  virtual void DidNavigateAnyFrame(
+      const content::LoadCommittedDetails& details,
+      const content::FrameNavigateParams& params) OVERRIDE;
+  virtual void DidStopLoading() OVERRIDE;
+
+  // Save the email address that we can display the info bar correctly.
+  void SaveEmail(const std::string& email);
+
+  // Remember the user's password for later use.
+  void SavePassword(const std::string& password);
+
+  // Email address and password of the account that has just logged in.
+  std::string email_;
+  std::string password_;
+
+  DISALLOW_COPY_AND_ASSIGN(OneClickSigninHelper);
+};
+
+#endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_