Currently, the WebView built on "Android arm64 Builder" [1], and used e.g. on Android Nexus5X WebView Perf bots, does not contain the combined 32+64 bit libraries (i.e. is 64 bit only).

This is probably OK as long as the test app (SystemWebViewShell.apk) does not contain any native code, and no 32-bit webview-containing apps are on the device (which will otherwise just crash in the background).

Still, it'll be probably a good idea to upgrade this builder at some point and make it produce the combined 32+64 apk as was done, e.g., on issue 603138.

[1]: https://build.chromium.org/p/chromium.perf/builders/Android%20arm64%20Builder