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Update from v1.0.15 by running third_party/polymer/v1_0/reproduce.sh.
This includes the fix for a bug in which the slider cannot be LTR on a RTL page.

Bug: 736954
Change-Id: I73f77fb0a053ec7f00b996a125f853848fbc56b6
Reviewed-on: https://chromium-review.googlesource.com/565067Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485429}