GitLab

Change the RendererScheduler's |ShouldYieldForHighPriorityWork| query
to always return true if we are awaiting touchstart response, regardless
of whether any high-priority work has been queued. This should facilitate
more aggressive yielding immediately after touchstart, reducing the risk
of long-running tasks interrupting dispatch of the subsequent touchmove.

BUG=452956

Review URL: https://codereview.chromium.org/933293004

Cr-Commit-Position: refs/heads/master@{#317130}