[Smart Lock] Adds UMA Metrics for actions on Account Chooser.

chrome/browser/password_manager/account_chooser_dialog_android.cc

Index: chrome/browser/password_manager/account_chooser_dialog_android.cc
diff --git a/chrome/browser/password_manager/account_chooser_dialog_android.cc b/chrome/browser/password_manager/account_chooser_dialog_android.cc
index f33ed44f2c5c104c8cfaf8066367675aa088bd40..e6f6a81b04951b4e406b83fd747d6f6aef7caa18 100644
--- a/chrome/browser/password_manager/account_chooser_dialog_android.cc
+++ b/chrome/browser/password_manager/account_chooser_dialog_android.cc
@@ -20,6 +20,7 @@
 #include "components/browser_sync/browser/profile_sync_service.h"
 #include "components/password_manager/core/browser/password_bubble_experiment.h"
 #include "components/password_manager/core/browser/password_manager_constants.h"
+#include "components/password_manager/core/browser/password_manager_metrics_util.h"
 #include "components/password_manager/core/browser/password_ui_utils.h"
 #include "components/password_manager/core/common/credential_manager_types.h"
 #include "jni/AccountChooserDialog_jni.h"
@@ -225,8 +226,13 @@ void AccountChooserDialogAndroid::ChooseCredential(
   using namespace password_manager;
   if (type == CredentialType::CREDENTIAL_TYPE_EMPTY) {
     passwords_data_.ChooseCredential(nullptr);
+    password_manager::metrics_util::LogAccountChooserUserAction(
+        password_manager::metrics_util::ACCOUNT_CHOOSER_DISMISSED);
+
     return;
   }
+  password_manager::metrics_util::LogAccountChooserUserAction(
+      password_manager::metrics_util::ACCOUNT_CHOOSER_CREDENTIAL_CHOSEN);
   const auto& credentials_forms =
       (type == CredentialType::CREDENTIAL_TYPE_PASSWORD)
           ? local_credentials_forms()