GitLab

Historically, there were a few discrepancies in behaviour of file
drag and drop on different platforms.  With introduction of Ozone and
implementation of X11 platform it became so complicated that a few tests
had been disabled.

The core difference between Linux and non-Linux was in how string and
URI contents are handled together.  Various Linux file managers pass
both string and URI together, for which there was a workaround in the
X11 implementation but not in Wayland one.

Another difference was that drags started in the renderer did not take
files (due to security reasons) but the non-backed data provider used
in ChromeOS and Wayland didn't recognise this scenario.

This CL unifies the behaviour on Linux platforms and makes the
non-backed data provider aware of drags originated from renderer, and
enables the tests that validate this behaviour.

Bug: 1121928, 1070483
Change-Id: If64857c60df295b37f1f5d4abe11338912134f5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461372Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/master@{#816195}