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 51d6ead979bf37f34502b9fe801e69386ebecd91..a58e281ea51f9fdbf62585614b6249e2e0a1e610 100644
--- a/chrome/test/base/test_browser_window.h
+++ b/chrome/test/base/test_browser_window.h
@@ -140,8 +140,11 @@ 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,