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"
+
+namespace {
+
+const char kMenuOpenHistogram[] = "Webapp.InstallabilityCheckStatus.MenuOpen";
+const char kMenuItemAddToHomescreenHistogram[] =
+    "Webapp.InstallabilityCheckStatus.MenuItemAddToHomescreen";

[Ilya Sherman, 2017/03/31 17:03:15]

Optional nit: I would go ahead and inline these names, but that's just a
personal preference, so just putting it out there as a suggestion.

[dominickn, 2017/04/03 00:06:46]

Done.

+}
+
+void InstallableMetrics::RecordMenuOpenHistogram(
+    InstallabilityCheckStatus status) {
+  UMA_HISTOGRAM_ENUMERATION(kMenuOpenHistogram, status,
+                            InstallabilityCheckStatus::MAX);
+}
+
+void InstallableMetrics::RecordMenuItemAddToHomescreenHistogram(
+    InstallabilityCheckStatus status) {
+  UMA_HISTOGRAM_ENUMERATION(kMenuItemAddToHomescreenHistogram, status,
+                            InstallabilityCheckStatus::MAX);
+}