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Most TODOs are assigned to the linked bugs. TODOs related to GroupEffect
are outdated so they are removed.

Bug: None
Change-Id: I7b413773904efd93c6b6959545c5d74f7d4760ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2227299
Commit-Queue: Majid Valipour <majidvp@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775276}