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Highlights frames queried during kMouseDown events in the
asynchronous targeting path.

https://screenshot.googleplex.com/4ioX6RouGkD

https://drive.google.com/open?id=1IpyR6nKXG9H4s9_Zkko8QTzOB5RagkEZ

R=riajiang@chromium.org

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Ica3b0b77dde61aad465d36c3bdb20715cc206c65
Reviewed-on: https://chromium-review.googlesource.com/c/1286352
Commit-Queue: Alexander Shah <zandershah@google.com>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Ria Jiang <riajiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609474}