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

chrome/browser/ui/views/frame/browser_view.h

Index: chrome/browser/ui/views/frame/browser_view.h
diff --git a/chrome/browser/ui/views/frame/browser_view.h b/chrome/browser/ui/views/frame/browser_view.h
index 13745344028339f939169d9e633fccb183e253fe..4f09d1cb86f802e50731ddbc73efcd2f271bd07c 100644
--- a/chrome/browser/ui/views/frame/browser_view.h
+++ b/chrome/browser/ui/views/frame/browser_view.h
@@ -364,8 +364,10 @@ class BrowserView : public BrowserWindow,
       override;
   void ShowAvatarBubbleFromAvatarButton(
       AvatarBubbleMode mode,
-      const signin::ManageAccountsParams& manage_accounts_params) override;
-  void ShowModalSigninWindow(AvatarBubbleMode mode) override;
+      const signin::ManageAccountsParams& manage_accounts_params,
+      signin_metrics::AccessPoint access_point) override;
+  void ShowModalSigninWindow(AvatarBubbleMode mode,
+                             signin_metrics::AccessPoint access_point) override;
   void CloseModalSigninWindow() override;
   int GetRenderViewHeightInsetWithDetachedBookmarkBar() override;
   void ExecuteExtensionCommand(const extensions::Extension* extension,