Notify page load metrics when the app enters the background.

chrome/browser/metrics/page_load_metrics_provider.h

Index: chrome/browser/metrics/page_load_metrics_provider.h
diff --git a/chrome/browser/metrics/page_load_metrics_provider.h b/chrome/browser/metrics/page_load_metrics_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..63d3a784971f28a569b378107516550e37f19c6d
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+++ b/chrome/browser/metrics/page_load_metrics_provider.h
@@ -0,0 +1,25 @@
+// Copyright 2016 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.
+
+#ifndef CHROME_BROWSER_METRICS_PAGE_LOAD_METRICS_PROVIDER_H_
+#define CHROME_BROWSER_METRICS_PAGE_LOAD_METRICS_PROVIDER_H_
+
+#include "base/macros.h"
+#include "components/metrics/metrics_provider.h"
+
+// MetricsProvider that interfaces with page_load_metrics. Note that this class
+// is currently only used on Android.
+class PageLoadMetricsProvider : public metrics::MetricsProvider {
+ public:
+  PageLoadMetricsProvider();
+  ~PageLoadMetricsProvider() override;
+
+  // metrics:MetricsProvider:
+  void OnAppEnterBackground() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PageLoadMetricsProvider);
+};
+
+#endif  // CHROME_BROWSER_METRICS_PAGE_LOAD_METRICS_PROVIDER_H_