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Currently we queue composition operations as "pending" if we are
currently handling a PK event. However, the pending composition is not
cleared after we handle the pending composition, so IMF thinks that
there's still some pending composition to be run in the next operation.

Bug: 1004149
Change-Id: Ibe7d6d49cd2d532f2a3300d63df15cd54eda98e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1806154Reviewed-by: Shu Chen <shuchen@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697513}