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This CL appends form and field renderer IDs to the autofill-information
attribute. For one thing, this helps interpret
chrome://autofill-internals output. For another, it will help matching
elements across rendered and browser process boundaries in unit tests.

Change-Id: I0bc5d50b7aa9922362e3d34a0d786bc741bfa9c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219487Reviewed-by: Dominic Battré <battre@chromium.org>
Commit-Queue: Christoph Schwering <schwering@google.com>
Cr-Commit-Position: refs/heads/master@{#772621}