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This CL implements Reset() which enables seeking to work as expected.
CodecWrapper also now takes a closure that it will call whenever an
output buffer is released back to the codec to signal that the codec
might now accept more input.

Bug: 660942
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I2b91cffafc6ca4940a7bdc819491359f47b592f0
Reviewed-on: https://chromium-review.googlesource.com/597383
Commit-Queue: Chris Watkins <watk@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491919}