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Problem is when CanDraw is false but needs_prepare_tiles is true
Scheduler will keep requesting begin frames but do nothing in a
begin frame since invalidate is blocked on CanDraw.

We already have an efficient shortcut that does not involve actually
producing a frame if invalidate is only requested for
needs_prepare_tiles. So the simple fix is simply allow invalidates for
this case.

Bug: 900557
Change-Id: Ib3c3e213e2e2461d7aa1b8dd8d2e91ab64042feb
Reviewed-on: https://chromium-review.googlesource.com/c/1334550
Commit-Queue: Bo <boliu@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607876}