Environment

• OS: macOS (10.12)
• Python: 2.7.10
• Werkzeug: 0.11.11
• Flask: 0.10.1

How to reproduce

• Check request.user_agents.platform when using Crosswalk webview on android.
  • its User-Agent is Mozilla/5.0 (Linux; Android 4.4.4; Google Nexus 7 2013 - 4.4.4 - API 19 - 1200x1920 Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Crosswalk/21.51.546.7 Safari/537.36

Expected result

• android

Actual result

• chromeos