mediaview: Implement ArcDocumentsProviderWatcherManager.

chrome/browser/chromeos/arc/fileapi/arc_documents_provider_watcher_manager.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_WATCHER_MANAGER_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_WATCHER_MANAGER_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "storage/browser/fileapi/watcher_manager.h"
+
+namespace arc {
+
+class ArcDocumentsProviderRootMap;
+
+// The implementation of storage::WatcherManager for ARC documents provider
+// filesystem.
+//
+// Note that this WatcherManager is not always correct. See comments at
+// ArcDocumentsProviderRoot::AddWatcher().
+class ArcDocumentsProviderWatcherManager : public storage::WatcherManager {
+ public:
+  explicit ArcDocumentsProviderWatcherManager(
+      ArcDocumentsProviderRootMap* roots);
+  ~ArcDocumentsProviderWatcherManager() override;
+
+  // storage::WatcherManager overrides.
+  void AddWatcher(const storage::FileSystemURL& url,
+                  bool recursive,
+                  const StatusCallback& callback,
+                  const NotificationCallback& notification_callback) override;
+  void RemoveWatcher(const storage::FileSystemURL& url,
+                     bool recursive,
+                     const StatusCallback& callback) override;
+
+ private:
+  // Owned by ArcDocumentsProviderBackendDelegate.
+  ArcDocumentsProviderRootMap* const roots_;
+
+  base::WeakPtrFactory<ArcDocumentsProviderWatcherManager> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcDocumentsProviderWatcherManager);
+};
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_WATCHER_MANAGER_H_