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This is a prerequisite to implement lazy loading for Polymer 3.

Bug: 1045266
Change-Id: I92c428cd2c18d6f4096ee5fbdd26ae77efb831ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321954Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Jon Mann <jonmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792491}