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We then change the style of all elements in the tree and benchmark the
time spent. This allows us to set up a benchmark for style manipulation
done using selectors.

This adds test to apply pseudo selectors on:
1. Children of elements
2. Grand children of elements
3. All elements (universal selector)
4. Checking for partrial match for an attribute

Bug: 741970
Change-Id: Idb1cb91fbbcc20044cf902bb5e193cb7a73343e0
Reviewed-on: https://chromium-review.googlesource.com/577330Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: nainar <nainar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488145}