Refactor download image-MIME-type-detection code.

chrome/browser/chromeos/note_taking_app_utils.h

+// 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_NOTE_TAKING_APP_UTILS_H_
+#define CHROME_BROWSER_CHROMEOS_NOTE_TAKING_APP_UTILS_H_
+
+class Profile;
+
+namespace base {
+class FilePath;
+}  // namespace base
+
+namespace chromeos {
+
+// Returns true if an app that can be used to take notes is available.
+bool IsNoteTakingAppAvailable(Profile* profile);
+
+// Launches the note-taking app to create a new note, optionally additionally
+// passing a file (|path| may be empty). IsNoteTakingAppAvailable() must be
+// called first.
+void LaunchNoteTakingAppForNewNote(Profile* profile,
+                                   const base::FilePath& path);
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_NOTE_TAKING_APP_UTILS_H_