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Since this pathway is triggered by tab helpers, they are now registered
in Chrome/Android much as they are already in Chrome/Desktop (by Browser).

A test is included which works mostly the same way as the desktop browser
test equivalent. Some plumbing was required to expose inner web contents to
Java, via JNI.

Bug: 1038584
Change-Id: I3127b0a392774c528f620220934283c4affe6643
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1986341Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733019}