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Android O's WebView zygote code doesn't handle split APKs correctly when
preloading the code for the current WebView implementation, creating an
incorrect entry in the Java classloader cache. This causes a crash when
the renderer process initializes, since it tries to load the native
library into two different classloaders as a result, which is not
permitted.

We're hoping to work around this using reflection to correct the cache
entry during the zygote preloading phase, so that when the renderer
starts up, it correctly reuses the preloaded classloader instead of
creating a new one. However, we're not sure if this reflection will work
on all devices due to vendor changes.

To validate that the reflection works, this CL will attempt the
reflection but not actually change anything - if the reflection fails
due to a framework change, it will catch the exception instead of
crashing, and simply record that in a static variable which can later be
logged with UMA.

Bug: 891452
Change-Id: I41dabb9c4cb4151676229a07abd37c803dbc3967
Reviewed-on: https://chromium-review.googlesource.com/1255388
Commit-Queue: Richard Coles <torne@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596293}