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Prior to this CL, SurfaceDependencyTracker read activation_dependencies
from the pending CompositorFrame's CompositorFrameMetadata. This meant
that it had to look up already resolved dependencies. It's more efficient
to use the remaining dependencies set tracked in Surface directly. The code
is also more compact and easier to read.

Bug: 672962
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I97acf5637fd92eaa6485f15601582dc75dd69c35
Reviewed-on: https://chromium-review.googlesource.com/1148226Reviewed-by: Saman Sami <samans@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577544}