Enable fading edges on ListViews

[SimonMarquis]

Hi P.Y.,
I was wondering what's your stance on fading edges on ListView?

I can't find any reference to it in any PRs/issues so I thought I might as well try.
I know it was kind of a delicate API back in the days for performance reasons:

Using fading edges may introduce noticeable performance degradations and should be used only when required by the application's visual design.

Source: aosp-mirror/platform_frameworks_base@1ef3fdb

IMO it adds some nice separation between what is scrollable and what is not. Also it doesn't seem that impacting on perfs (though I've nothing to back this up).
I've thought about using View's elevation, but I don't think this is backported to API 14 and would require changing many view hierarchies.

Here is what it look like in the Heap Dump Screen:

Without fading edge	With fading edge

[pyricau]

Looking great! To be honest I simply did not think about it.