|Composite BG-color animation
||xidachen@ resolved a few problems and this feature is now close to finch on Beta. Specifically we have enabled field trial testing (CL) so all perf bots can run tests with this feature. All regressions and improvements are summarized here.
||We have resolved the memory increase (CL). Here is an example where a perf test used to crash due to OOM now works fine.
||There is a performance regression (crbug.com/1238554) that has been addressed as well. It was fixed by this CL where we found that we were doing a lot of un-necessary work which slows it down.
||Note that the above curve has improved, but didn’t go back to the original level. With further investigation, we found that the root cause is because the tests aren’t well written. Specifically, the tests contains background-color animation on a solid-color layer, and our system has optimizations towards solid-color layer which is not implemented in CompositeBGColorAnimation yet.
||A pinpoint job was started where the layer made to be not long solid-color and the above shows the result. The right column is with CompositeBGColorAnimation and we can see that it actually made a performance improvement.
||mehdika@ modified Element Fragment code (that already exists) to work for any other element.
<td><td>For now we just scroll to the element, later we will add more
features like highlight the element, etc.</td></td>
<td><td>We use the <a
syntax</a> and find the element with the help of QuerySelector().</td></td>
|| flackr@ fixed two problems in elastic overscroll.
||The first problem is the subtle shift in content during overscroll bounce. The fix is to use ScrollTree::container_bounds which includes container_bounds_delta.
||Another fix is to reduce elastic overscroll stretch. Particularly, we have updated parameters in ElasticOverscrollControllerExponential to more closely match native overscroll.