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Add a class that helps build valid CompostiorFrames for tests. Also
convert some tests to use the builder and update existing helper
functions.

Bug: 758707
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I293ef25799d2db398e905f34e5eb0650a3525677
Reviewed-on: https://chromium-review.googlesource.com/796931Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521774}