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Now that overlay rendering takes place in VIZ, there is no need to pass
read-write handles across processes. This change migrates to the new
base::ReadOnlySharedMemoryRegion API. It is also a prerequisite to
migrating the rest of the video capture stack to the new read-only API.

Bug: 797470,843117
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I87e16de42aa00e1fa0edba55a9cbf013fc345440
Reviewed-on: https://chromium-review.googlesource.com/1166248
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Saman Sami <samans@chromium.org>
Reviewed-by: Xiangjun Zhang <xjz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587022}