Touch event timeout is flaky

• Component: UI Events
• Status: NEW ---

[Rick Byers]

Repro on mobile Safari in iOS 8.3:
- Load http://rbyers.net/touch-timeout.html
- Set the delay to 800ms
- Try scrolling anywhere within the blue border box
- After a brief delay, the document scrolls up
- Scroll it back down
- Now just touch (without scrolling) within the blue border box
- The moment your finger goes down, the page moves up.  WTF?

Note that the behavior is quite dynamic.  If you try with the default 300ms timeout first, then the behavior will not reproduce after increasing the timeout to 800ms (you must reload the page to see the issue).

I'm trying to better understand how scrolling in Safari reacts to slow touch event handlers and I'm very confused (some notes here: https://docs.google.com/document/d/12k_LL_Ot9GjF8zGWP9eI_3IMbSizD72susba0frg44Y/edit#heading=h.5zfdv2co2oj).  Is the code for this public or internal?

[Rick Byers]

I can no longer reproduce this reliably.  Ben and I discussed this offline and it sounds like there are definitely some bugs here with the timeout behavior making it unreliable.  Perhaps there should just be a fixed 1000ms timeout?  This is what we plan to try in Blink: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/Y4ghiJy6Fss