Allow the app banner installability check to run on page load.

chrome/browser/installable/installable_metrics.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/installable/installable_metrics.h"
+
+#include "base/metrics/histogram_macros.h"
+
+void InstallableMetrics::RecordMenuOpenHistogram(
+    InstallabilityCheckStatus status) {
+  UMA_HISTOGRAM_ENUMERATION("Webapp.InstallabilityCheckStatus.MenuOpen", status,
+                            InstallabilityCheckStatus::COUNT);
+}
+
+void InstallableMetrics::RecordMenuItemAddToHomescreenHistogram(
+    InstallabilityCheckStatus status) {
+  UMA_HISTOGRAM_ENUMERATION(
+      "Webapp.InstallabilityCheckStatus.MenuItemAddToHomescreen", status,
+      InstallabilityCheckStatus::COUNT);
+}