[fsp] Rename ObserveEntry with AddWatcher.

chrome/browser/chromeos/file_system_provider/watcher.h

+// Copyright 2014 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_FILE_SYSTEM_PROVIDER_WATCHER_H_
+#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_WATCHER_H_
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/files/file_path.h"
+#include "url/gurl.h"
+
+namespace chromeos {
+namespace file_system_provider {
+
+struct Watcher;
+struct Subscriber;
+
+// Key for storing a watcher in the map. There may be two watchers per path,
+// as long as one is recursive, and the other one not.
+struct WatcherKey {
+  WatcherKey(const base::FilePath& entry_path, bool recursive);
+  ~WatcherKey();
+
+  struct Comparator {
+    bool operator()(const WatcherKey& a, const WatcherKey& b) const;
+  };
+
+  base::FilePath entry_path;
+  bool recursive;
+};
+
+// List of watchers.
+typedef std::map<WatcherKey, Watcher, WatcherKey::Comparator> Watchers;
+
+// Map of subscribers for notifications about a watcher.
+typedef std::map<GURL, Subscriber> Subscribers;
+
+// Represents a subscriber for notification about a watcher. There may be up to
+// one subscriber per origin for the same watcher.
+struct Subscriber {
+  Subscriber();
+  ~Subscriber();
+
+  // Origin of the subscriber.
+  GURL origin;
+
+  // Whether the subscriber should be restored after shutdown or not.
+  bool persistent;
+};
+
+// Represents a watcher on a file system.
+struct Watcher {
+  Watcher();
+  ~Watcher();
+
+  // Map of subscribers for notifications of the watcher.
+  Subscribers subscribers;
+
+  // Path of the watcher.
+  base::FilePath entry_path;
+
+  // Whether watching is recursive or not.
+  bool recursive;
+
+  // Tag of the last notification for this watcher. May be empty if not
+  // supported.
+  std::string last_tag;
+};
+
+}  // namespace file_system_provider
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_WATCHER_H_