Roll openmax 6625be0:7a179b9
Roll openmax 6625be0:7a179b9

Picks up:
7a179b9 Only pass android_toolchain in android builds.

BUG=563844
TBR=rtoy@chromium.org

Review URL: https://codereview.chromium.org/1483263004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#362467}

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