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

chrome/browser/ui/browser_window.h

Index: chrome/browser/ui/browser_window.h
diff --git a/chrome/browser/ui/browser_window.h b/chrome/browser/ui/browser_window.h
index b334c083c5d17408c0ea3d18c63245a7421d58e9..28d06ca6791b91ef23bec93fe925a6922880f3d2 100644
--- a/chrome/browser/ui/browser_window.h
+++ b/chrome/browser/ui/browser_window.h
@@ -17,6 +17,7 @@
 #include "chrome/browser/ui/sync/one_click_signin_sync_starter.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "components/signin/core/browser/signin_header_helper.h"
+#include "components/signin/core/browser/signin_metrics.h"
 #include "components/translate/core/common/translate_errors.h"
 #include "ui/base/base_window.h"
 #include "ui/base/window_open_disposition.h"
@@ -374,6 +375,8 @@ class BrowserWindow : public ui::BaseWindow {
 
   // Shows the avatar bubble on the window frame off of the avatar button with
   // the given mode. The Service Type specified by GAIA is provided as well.
+  // |access_point| indicates the access point used to open the Gaia sign in
+  // page.
   enum AvatarBubbleMode {
     AVATAR_BUBBLE_MODE_DEFAULT,
     AVATAR_BUBBLE_MODE_ACCOUNT_MANAGEMENT,
@@ -384,11 +387,17 @@ class BrowserWindow : public ui::BaseWindow {
     AVATAR_BUBBLE_MODE_SHOW_ERROR,
     AVATAR_BUBBLE_MODE_FAST_USER_SWITCH,
   };
-  virtual void ShowAvatarBubbleFromAvatarButton(AvatarBubbleMode mode,
-      const signin::ManageAccountsParams& manage_accounts_params) = 0;
+  virtual void ShowAvatarBubbleFromAvatarButton(
+      AvatarBubbleMode mode,
+      const signin::ManageAccountsParams& manage_accounts_params,
+      signin_metrics::AccessPoint access_point) = 0;
 
   // Shows the signin flow for |mode| in a tab-modal dialog.
-  virtual void ShowModalSigninWindow(AvatarBubbleMode mode) = 0;
+  // |access_point| indicates the access point used to open the Gaia sign in
+  // page.
+  virtual void ShowModalSigninWindow(
+      AvatarBubbleMode mode,
+      signin_metrics::AccessPoint access_point) = 0;
 
   // Closes the tab-modal signin flow opened with ShowModalSigninWindow, if it's
   // open. Does nothing otherwise.