John Reck faa1b0ab2a Have HWUI validate the WebViewFunctors at registration
Also tweak how webview's plat_support creates the functor
sruct to be thread-safe, avoids any potential race conditions
even though WebView itself is stated to be thread-hostile in
general. It's too easy to have this just be defined-safe instead.

Bug: 186814981
Test: build & boot, no crashes in real-webview apps
Change-Id: I06f02a279e248fee375ce133c5ce9a2250665ad9
2021-05-13 17:17:21 -04:00
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