[Backport] Reintroduce glib event loop 2/3

Make it possible to use glib message pump in Ozone

Ozone implementation assumes libevent MessagePump is used (more specifically,
MessagePumpLibevent and X11EventSourceLibevent are directly referenced), which
makes it impossible to build/run ozone-based builds with use_glib=true. This CL
changes it, making use mainly of Message{Pump,Loop}CurrentFor{UI,IO} APIs.
The main motivation for this is to bring up glib MessagePump/EventSource in
ozone/x11 UI thread, which is part of the effort to migrate away from Aura/X11
to Ozone in Linux desktop.

So, with this change, use_glib can be set to true when configuring ozone/linux
builds.  Additionally, X11EventSourceLibevent is renamed (as it is not
libevent-specific anymore).

Also, from now on it will be possible to start XEvent => ui::Event migration in
Aura/X11, reducing even more the delta between ozone and non-ozone X11. A
preliminary step towards that is done in this CL, which consists of moving
XEventDispatcher API out of X11EventSourceDelegate into X11EventSource, so that
its consumers should not use delegate implementation to register/unregister
|XEventDispatcher|s anymore, thus making delegate implementation more like an
internal detail, at some point it might makes sense to merge delegate impl into
X11EventSource and even move it into ozone/x11 layer.

Bug: 988094, 789065
Change-Id: I46c38aa26475ae8f3f89ef0c632d4c8ffb76fd7c
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/chromium/ui/events/ozone/evdev/event_converter_evdev.cc b/chromium/ui/events/ozone/evdev/event_converter_evdev.cc
index 8f9bebfa0f7..684514ff011 100644
--- a/chromium/ui/events/ozone/evdev/event_converter_evdev.cc
+++ b/chromium/ui/events/ozone/evdev/event_converter_evdev.cc
@@ -45,7 +45,7 @@ EventConverterEvdev::~EventConverterEvdev() {
 
 void EventConverterEvdev::Start() {
   base::MessageLoopCurrentForUI::Get()->WatchFileDescriptor(
-      fd_, true, base::MessagePumpLibevent::WATCH_READ, &controller_, this);
+      fd_, true, base::MessagePumpForUI::WATCH_READ, &controller_, this);
   watching_ = true;
 }