Log the creation of Sign In related dialog boxes.

chrome/browser/ui/signin_view_controller.cc

Index: chrome/browser/ui/signin_view_controller.cc
diff --git a/chrome/browser/ui/signin_view_controller.cc b/chrome/browser/ui/signin_view_controller.cc
index 6ca3c480574e19145151d0998d3cb3ec63687081..ea3bb66cd816d02ed0f8f5c367d42e95d814af5f 100644
--- a/chrome/browser/ui/signin_view_controller.cc
+++ b/chrome/browser/ui/signin_view_controller.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/ui/signin_view_controller.h"
 
+#include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/signin_view_controller_delegate.h"
 #include "components/signin/core/common/profile_management_switches.h"
 
@@ -24,6 +25,7 @@ void SigninViewController::ShowModalSignin(
   signin_view_controller_delegate_ =
       SigninViewControllerDelegate::CreateModalSigninDelegate(
           this, mode, browser, access_point);
+  chrome::RecordDialogCreation(chrome::DialogIdentifier::SIGN_IN);
 }
 
 void SigninViewController::ShowModalSyncConfirmationDialog(Browser* browser) {
@@ -33,6 +35,8 @@ void SigninViewController::ShowModalSyncConfirmationDialog(Browser* browser) {
   signin_view_controller_delegate_ =
       SigninViewControllerDelegate::CreateSyncConfirmationDelegate(this,
                                                                    browser);
+  chrome::RecordDialogCreation(
+      chrome::DialogIdentifier::SIGN_IN_SYNC_CONFIRMATION);
 }
 
 void SigninViewController::ShowModalSigninErrorDialog(Browser* browser) {
@@ -41,6 +45,7 @@ void SigninViewController::ShowModalSigninErrorDialog(Browser* browser) {
   // is closed.
   signin_view_controller_delegate_ =
       SigninViewControllerDelegate::CreateSigninErrorDelegate(this, browser);
+  chrome::RecordDialogCreation(chrome::DialogIdentifier::SIGN_IN_ERROR);
 }
 
 void SigninViewController::CloseModalSignin() {