Log the creation of Sign In related dialog boxes.

chrome/browser/ui/webui/signin/signin_email_confirmation_dialog.cc

Index: chrome/browser/ui/webui/signin/signin_email_confirmation_dialog.cc
diff --git a/chrome/browser/ui/webui/signin/signin_email_confirmation_dialog.cc b/chrome/browser/ui/webui/signin/signin_email_confirmation_dialog.cc
index 403f0ea3c9113772f407fc817142f35782523c62..2af9a846d7e8a558dd259bec46a4ed0136d36b95 100644
--- a/chrome/browser/ui/webui/signin/signin_email_confirmation_dialog.cc
+++ b/chrome/browser/ui/webui/signin/signin_email_confirmation_dialog.cc
@@ -10,6 +10,7 @@
 #include "base/json/json_writer.h"
 #include "base/metrics/user_metrics.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/webui/signin/signin_email_confirmation_ui.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/browser_resources.h"
@@ -70,7 +71,10 @@ SigninEmailConfirmationDialog::SigninEmailConfirmationDialog(
       profile_(profile),
       last_email_(last_email),
       new_email_(new_email),
-      callback_(callback) {}
+      callback_(callback) {
+  chrome::RecordDialogCreation(
+      chrome::DialogIdentifier::SIGN_IN_EMAIL_CONFIRMATION);
+}
 
 SigninEmailConfirmationDialog::~SigninEmailConfirmationDialog() {}