UMA stats for stylus usage

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 extensions {
+class AppWindow;
+}  // namespace extensions
+
 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);
 
+// Returns true if current app window is note taking app window.
+bool IsCurrentAppNoteTakingApp(extensions::AppWindow* app_window);

[xiyuan, 2016/09/12 20:15:47]

nit: IsCurrentAppNoteTakingApp -> IsNoteTakingApp

CurrentApp sounds redundant.

[xiaoyinh(OOO Sep 11-29), 2016/09/16 18:41:15]

Done.

+
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NOTE_TAKING_APP_UTILS_H_