Add UMA logging of implemented WebView callbacks

This change was previously submitted as crrev.com/c/5611342,
but reverted because it caused StrictMode violations.

This change reintroduces the method logging, but explicitly allows the
NonSdkApiAccessed violation to occur.

The cause for the violation is that WebViewClient and WebChromeClient
contains methods at runtime that are no longer part of the Android SDK
because they were removed in earlier versions. When we then try to get a
method reference on an implementation of one of those classes to one of
those removed methods, we will then get a violation.

To avoid this warning, we only try to access methods that
are still part of the public API.

Original change's description:
> Revert "Add UMA logging of implemented WebView callbacks"
>
> This reverts commit 8251daa6c77876c83f3fedcad6cd0779b57b25e6.
>
> Reason for revert: Reflection causes NonSdkApiUsedViolation
>                    b/339432838
>
> Original change's description:
> > Add UMA logging of implemented WebView callbacks
> >
> > Bug: 339432838
> > Change-Id: I1a28801ca612a3f7f14bdb7cf91de5239430f6c6
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5526660
> > Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
> > Reviewed-by: Peter Conn <peconn@chromium.org>
> > Commit-Queue: Peter Pakkenberg <pbirk@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#1298598}
>
> Bug: 339432838
> Change-Id: I0d3484e0d1cd223329c86dbb68f9f04e4937d745
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5611342
> Commit-Queue: Peter Pakkenberg <pbirk@chromium.org>
> Reviewed-by: Peter Conn <peconn@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1312679}

Bug: 339432838
Change-Id: I1a4ee165d155a48a83abad1ef148efcd1b37224c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5621177
Commit-Queue: Peter Pakkenberg <pbirk@chromium.org>
Reviewed-by: Richard (Torne) Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1316916}

• android_webview/glue/BUILD.gn[diff]
• android_webview/glue/java/src/com/android/webview/chromium/ApiImplementationLogger.java[Added - diff]
• android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java[diff]
• android_webview/javatests/src/org/chromium/android_webview/test/ApiImplementationLoggerTest.java[Added - diff]
• android_webview/test/BUILD.gn[diff]