Chrome Version: 56.0.2924.87 (64-bit)
OS: MacOSX 10.12.3

What steps will reproduce the problem?
(1) Visit http://www.gangavatika.com/.
(2) Scroll down until you're at the middle of the page and start scrolling up slowly.

What is the expected result?
Scrolling up should be smooth.

What happens instead?
You start seeing checkerboards on every frame the moment you reach the canvas. No matter what the scrolling speed.

I've attached a trace. You can see after ~6s, canvas doing a bunch of work at the beginning of the main frame. What's weird is that throughout the gesture, we draw before the commit (smoothness takes priority mode). Usually cc has enough pre-painted immediately outside the viewport for scrolls but in this case we are still checker-boarding.

junov@, do you mind taking a look and see if there is anything actionable here?

 

Deleted: trace_canvas_checkerboarding.json.gz 2.2 MB

trace_canvas_checkerboarding.json.gz 2.2 MB Download