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This CL adds a few integration tests. They stop at the bridge since the
execution of native code slows the tests down, introduces flakiness and
most-likely doesn't work on Kitkat.

Bug: 957532
Change-Id: I291c50ef7b8772198c89109bbe3acd885a43d054
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845372
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703368}