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Right now the Java side lives in webview_instrumentation_test_apk
while the C++ side lives in webview_instrumentation_apk. This CL moves
the native method to a new Java class that lives in
webview_instrumentation_apk so that both the Java and C++ sides live
in the same APK. This is necessary for the proxy natives conversion.

Bug: 997199
Change-Id: Ia039cfcde5d18de80479c30086f67eedb531aca1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899196Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713090}