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This CL implements IterElementsWithTag to avoid not needed recursion.

On local machine it saved around 1s (from 7.6s to 6.6s).

Bug: 1016281
Change-Id: I0fea65892bc52574fd4e6fd3fd2455ae3ec646e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872052
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709564}