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We were not initializing the position buffer for a text run.

TBR=enne@chromium.org

Bug: 829622
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ie64d63b18431198d12abc70a091ce2e24ea0d4d0
Reviewed-on: https://chromium-review.googlesource.com/1041656
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555676}