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Update SurfaceAggregator tests.

Replace passing around an array+size with passing a vector to cleanup
code.

Bug: none
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I04eb35d9af0c96db0cddaa2a6b5f526517d7ec3e
Reviewed-on: https://chromium-review.googlesource.com/c/1280858Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599987}