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Ctrl+Shift+H to trigger. Requires --enable-viz-hit-test-debug flag and logging level of 1 on hit_test_debug_key_event_observer.

Adds observer to render_widget_host_impl to act on OnInputEventAck.

Example: https://pastebin.com/pcxrZv6A

R=riajiang@chromium.org

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I1c9a0867debe5b4aa670a51f85fe24909073374c
Reviewed-on: https://chromium-review.googlesource.com/1226099
Commit-Queue: Alexander Shah <zandershah@google.com>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Ria Jiang <riajiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595563}