Initialize orig_binding in ScopedPixelUnpackBufferOverride.

Caught by the fuzzer which can't guarentee that orig_binding will be
written to.

BUG=773952

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: Ib3283bec5c7177eab6a3721f8a9f576d783968f4
Reviewed-on: https://chromium-review.googlesource.com/723759
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509501}
1 file changed