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This improves Web UI load times with Polymer 2 by 11-14%.

Bug: 738611
Change-Id: I2bf47a8b72730d019772824f8af9359dad30b364
Reviewed-on: https://chromium-review.googlesource.com/c/1351421
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611398}