Setup field trial for one-click signin inforbar.

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_
 
 #include <string>
 
 #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:
+  explicit OneClickSigninHelper(content::WebContents* web_contents);
+  virtual ~OneClickSigninHelper();
+
   // 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.  If
   // |check_connected| is true, then the profile is checked to see if it's
   // already connected to a google account or if the user has already rejected
   // one-click sign-in with this email, in which cases a one click signin
   // should not be offered.
   static bool CanOffer(content::WebContents* web_contents,
                        const std::string& email,
                        bool check_connected);
 
+  // Initialize a finch experiment for the infobar.
+  static void InitializeFieldTrial();
+
   // Looks for the 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);
-  virtual ~OneClickSigninHelper();
-
  private:
   // The portion of ShowInfoBarIfPossible() that needs to run on the UI thread.
   static void ShowInfoBarUIThread(const std::string& session_index,
                                   const std::string& email,
                                   int child_id,
                                   int route_id);
 
   // content::WebContentsObserver overrides.
   virtual void DidNavigateAnyFrame(
       const content::LoadCommittedDetails& details,
@@ skipping 10 matching lines @@
 
   // Information about the account that has just logged in.
   std::string session_index_;
   std::string email_;
   std::string password_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_