[Ozone] Update GPUTestHelper to properly use the message filter
[Ozone] Update GPUTestHelper to properly use the message filter

Normally messages sent to the GPU process are first passed on the IO
thread to the message filter. If they aren't handled by the filter they
are then forwarded to the GPU main thread. This patch adds the ability
to handle the messages in the filter before sending it to the GPU main
thread.

BUG=536113

Review URL: https://codereview.chromium.org/1308993007

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#353797}

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