Fix up preventDefault error on Android

[ckybonist]

Description

Focus on video player and scroll will raise the error

Ignored attempt to cancel a touchend event with cancelable=false, for example because scrolling is in progress and cannot be interrupted.

To reproduce the error:

1. Put your finger on video player (do not lift up the finger)
2. Scroll up and down

Specific Changes proposed

Check event.cancelable before executing event.preventDefault

see: https://developer.mozilla.org/en-US/docs/Web/API/Event/preventDefault#notes

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

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[gkatsev]

Looks like cancelable should be supported most places, so, LGTM

[welcome]

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