Implement newly designed sign-in related histograms for desktop platorms.

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"
 
 class Browser;
 class ModalSigninDelegate;
 class Profile;
 
 namespace content {
 class WebContentsDelegate;
 }
 
+namespace signin_metrics {
+enum class AccessPoint;
+}
+
 namespace views {
 class WebView;
 }
 
 class SigninViewController {
  public:
   SigninViewController();
   ~SigninViewController();
 
   // 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(
       content::WebContentsDelegate* delegate,
       profiles::BubbleViewMode mode,
-      Profile* profile);
+      Profile* profile,
+      signin_metrics::AccessPoint access_point);
 
   // Shows the signin flow as a tab modal dialog attached to |browser|'s active
   // web contents.
-  void ShowModalSignin(profiles::BubbleViewMode mode, Browser* browser);
+  // |access_point| indicates the access point used to open the Gaia sign in
+  // page.
+  void ShowModalSignin(profiles::BubbleViewMode mode,
+                       Browser* browser,
+                       signin_metrics::AccessPoint access_point);
 
   // Closes the tab-modal signin flow previously shown using this
   // SigninViewController, if one exists. Does nothing otherwise.
   void CloseModalSignin();
 
   // Notifies this object that it's |modal_signin_delegate_| member has become
   // invalid.
   void ResetModalSigninDelegate();
 
  private:
    ModalSigninDelegate* modal_signin_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninViewController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PROFILES_SIGNIN_VIEW_CONTROLLER_H_