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This CL makes LayerWithRealCompositorTest and SnapshotAuraTest
parameterized to run using GLRenderer and SkiaRenderer. It adds
new constructor to TestContextFactories with parameter to specify which
renderer to use. Old constructor selects renderer based on feature state.

Bug: 956144
Change-Id: I153c15359f213f25142b4ae705b78b2bb4d6db7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716924Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681337}