Show notifications on low disk space.

chrome/browser/chromeos/ui/low_disk_notification.h

Index: chrome/browser/chromeos/ui/low_disk_notification.h
diff --git a/chrome/browser/chromeos/ui/low_disk_notification.h b/chrome/browser/chromeos/ui/low_disk_notification.h
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+// 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_CHROMEOS_UI_LOW_DISK_NOTIFICATION_H_
+#define CHROME_BROWSER_CHROMEOS_UI_LOW_DISK_NOTIFICATION_H_
+
+#include <stdint.h>
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/time/time.h"
+
+namespace message_center {
+class Notification;
+}
+
+namespace chromeos {
+
+class CryptohomeClient;
+
+class LowDiskNotification {
+ public:
+  explicit LowDiskNotification(CryptohomeClient* cryptohome_client);
+  ~LowDiskNotification();
+
+  void OnLowDiskSpace(uint64_t free_disk_bytes);
+
+ private:
+  enum Severity { NONE = -1, MEDIUM = 0, HIGH = 1 };
+
+  std::unique_ptr<message_center::Notification> CreateNotification(
+      Severity severity);
+  Severity GetSeverity(uint64_t free_disk_bytes);
+
+  base::Time last_notification_time_;
+  Severity last_notification_severity_;
+
+  CryptohomeClient* cryptohome_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(LowDiskNotification);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_UI_LOW_DISK_NOTIFICATION_H_