DesktopAndCursorComposer already handles a null MouseCursorMonitor. This
CL allows that code-path to be utilized by callers that already have a
MouseCursorMonitor, allowing its callbacks to be re-used by this class.
This is more efficient, and works around an apparent X Server deadlock
on Linux if multiple MouseCursorMonitors are simultaneously active.
The intended use-case for this is to allow the host-side cursor to be
composited into the desktop image if mouse-lock is active at the client.
Bug: chromium:1043325
Change-Id: I7e036850dd8c17fe55e57db252392062a847d10f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/166581
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#30312}
c380e97ee6