Add new app banner metrics using InstallableStatusCode.

chrome/browser/banners/app_banner_manager_desktop.cc

Index: chrome/browser/banners/app_banner_manager_desktop.cc
diff --git a/chrome/browser/banners/app_banner_manager_desktop.cc b/chrome/browser/banners/app_banner_manager_desktop.cc
index bab306a008fff7ea2c58aaaa8f24208b802e2206..78b6039aeba40ed0837cd557044ccfa70ac4964f 100644
--- a/chrome/browser/banners/app_banner_manager_desktop.cc
+++ b/chrome/browser/banners/app_banner_manager_desktop.cc
@@ -89,6 +89,9 @@ void AppBannerManagerDesktop::ShowBanner() {
   if (infobar) {
     RecordDidShowBanner("AppBanner.WebApp.Shown");
     TrackDisplayEvent(DISPLAY_EVENT_WEB_APP_BANNER_CREATED);
+    TrackInstallableErrorCode(SHOWING_WEB_APP_BANNER);
+  } else {
+    TrackInstallableErrorCode(FAILED_TO_CREATE_BANNER);
   }
 }