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Add mipmap_state_ in move constructor and the move assignment operator.

BUG=817887

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I460f018ec73f791bb496c0b873dd2fb68ab58128
Reviewed-on: https://chromium-review.googlesource.com/965405Reviewed-by: David Reveman <reveman@chromium.org>
Commit-Queue: Xing Xu <xing.xu@intel.com>
Cr-Commit-Position: refs/heads/master@{#543643}