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This includes making SharedMemory::GetReadOnlyHandle() const.
Getting a handle with write permissions is currently const, so it makes
no sense at all that getting a handle with read only permissions is not
const :).

Bug: 653871
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: Ie98fde38535f5ffe0ae51949ae043c38c9791eb8
Reviewed-on: https://chromium-review.googlesource.com/806655
Commit-Queue: Max Morin <maxmorin@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522064}