The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/779888ee1eba464ede92e539999ebb772afaa0ae

commit 779888ee1eba464ede92e539999ebb772afaa0ae
Author: nzolghadr <nzolghadr@chromium.org>
Date: Fri Mar 31 17:10:02 2017

Set trusted flag of coalesced events at creation

Set trusted, bubbles, and cancelable flags of
the coalesced events to true at the creation time.
Note that we didn't set it along with the original
event to avoid unnecessary traverse of all the
coalesced events for redispatching.
This CL also adds a wpt test and its automation for
coalesced events.
Note that the test doesn't quite pass as we don't
run them with compositor thread enabled.

BUG= 704219 

Review-Url: https://codereview.chromium.org/2772443006
Cr-Commit-Position: refs/heads/master@{#461155}

[modify] https://crrev.com/779888ee1eba464ede92e539999ebb772afaa0ae/third_party/WebKit/LayoutTests/TestExpectations
[add] https://crrev.com/779888ee1eba464ede92e539999ebb772afaa0ae/third_party/WebKit/LayoutTests/external/wpt/pointerevents/extension/pointerevent_coalesced_events_attributes-manual-expected.txt
[add] https://crrev.com/779888ee1eba464ede92e539999ebb772afaa0ae/third_party/WebKit/LayoutTests/external/wpt/pointerevents/extension/pointerevent_coalesced_events_attributes-manual.html
[add] https://crrev.com/779888ee1eba464ede92e539999ebb772afaa0ae/third_party/WebKit/LayoutTests/external/wpt_automation/pointerevents/extension/pointerevent_coalesced_events_attributes-manual-automation.js
[modify] https://crrev.com/779888ee1eba464ede92e539999ebb772afaa0ae/third_party/WebKit/Source/core/events/PointerEventFactory.cpp