DevTools: use inotify to pick changes on the filesystem.

chrome/browser/devtools/devtools_file_watcher.h

+// Copyright (c) 2015 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_DEVTOOLS_DEVTOOLS_FILE_WATCHER_H_
+#define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_FILE_WATCHER_H_
+
+#include <vector>
+
+#include "base/callback.h"
+#include "base/macros.h"
+
+namespace base {
+class FilePath;
+class FilePathWatcher;
+}
+
+class DevToolsFileWatcher {
+ public:
+  using WatchCallback = base::Callback<void(const std::vector<std::string>&)>;
+  explicit DevToolsFileWatcher(const WatchCallback& callback);
+  ~DevToolsFileWatcher();
+
+  void AddWatch(const base::FilePath& path);
+  void RemoveWatch(const base::FilePath& path);
+
+ private:
+  class SharedFileWatcher;
+  static SharedFileWatcher* s_shared_watcher_;
+
+  void InitSharedWatcher();
+  void FileChanged(const base::FilePath&, int);
+
+  scoped_refptr<SharedFileWatcher> shared_watcher_;
+  WatchCallback callback_;
+  DISALLOW_COPY_AND_ASSIGN(DevToolsFileWatcher);
+};
+
+#endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_FILE_WATCHER_H_