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active_tree_needs_first_draw_ was set to false on invalidate so that it
wouldn't block commits. Instead, fallback tick handling guarantees that
every activated frame has a draw. This CL removes the change along with
its associated test (introduced in crrev.com/1092123005).

Bug: 819430
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: Ibf6008512638943b7caa771f7ca6a953851607d6
Reviewed-on: https://chromium-review.googlesource.com/953208Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: James Wallace-Lee <jamwalla@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542216}