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

chrome/test/base/test_browser_window.h

Index: chrome/test/base/test_browser_window.h
diff --git a/chrome/test/base/test_browser_window.h b/chrome/test/base/test_browser_window.h
index ebe738694d7931d54e800470a1413578a3a8d678..a67dcc82378aa6798bf9048b370e625f186a7001 100644
--- a/chrome/test/base/test_browser_window.h
+++ b/chrome/test/base/test_browser_window.h
@@ -147,8 +147,11 @@ class TestBrowserWindow : 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,