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We build raster queues for both pending layers and active layers when
checking IsReadyToActivate() in issuing signals. If there is no pending
tree from the TileManageClient, we can save the CPU time by skipping
IsReadyToActivate().

Bug: 880190
Change-Id: Iac2e162ffb1d462cd3a3168cfed7c22363013537
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505115Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822223}