commit 2d3141fd67830dd068b0bc14218afae8acc844fc
author Ken Buchanan <kenrb@chromium.org> Wed Jan 17 23:08:39 2018
committer Commit Bot <commit-bot@chromium.org> Wed Jan 17 23:08:39 2018
tree f9a6edcaf7ebdf2b1e678b318635890f22ae8ab3
parent 3948511dd9cf0e8c38b702e1e707181479f146c3

Time out async hit test queries

This CL adds a timer to RenderWidgetTargeter to detect when a request
has been sent to an unresponsive renderer. When the timer fires, the
following happens:
 - the renderer is tracked as unresponsive so that further queries will
   not be sent there;
 - the event is sent to the parent of the unresponsive renderer if it
   has one;
 - if the main frame is unresponsive, the event is sent there anyway

If a hit test query response is later received from a renderer after the
timer has fired, then that renderer is no longer tracked as
unresponsive and the response is discarded.

Bug: 801043
Change-Id: I854cd3179170367df233bb833fd69d0ff449e6e3
Reviewed-on: https://chromium-review.googlesource.com/865815
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#529941}