Implement GLX for Ozone X11.

ui/ozone/platform/x11/gl_surface_glx_ozone.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/ozone/platform/x11/gl_surface_glx_ozone.h"
+
+#include <X11/Xlib.h>
+
+namespace ui {
+
+GLSurfaceGLXOzone::GLSurfaceGLXOzone(gfx::AcceleratedWidget window)
+    : NativeViewGLSurfaceGLX(window) {}
+
+GLSurfaceGLXOzone::~GLSurfaceGLXOzone() {
+  Destroy();
+}
+
+void GLSurfaceGLXOzone::RegisterEvents() {
+  auto* event_source = X11EventSourceLibevent::GetInstance();
+  // Can be null in tests, when we don't care about Exposes.
+  if (event_source) {
+    XSelectInput(gfx::GetXDisplay(), window(), ExposureMask);
+    event_source->AddXEventDispatcher(this);
+  }
+}
+
+void GLSurfaceGLXOzone::UnregisterEvents() {
+  auto* event_source = X11EventSourceLibevent::GetInstance();
+  if (event_source)
+    event_source->RemoveXEventDispatcher(this);
+}
+
+bool GLSurfaceGLXOzone::DispatchXEvent(XEvent* event) {
+  if (!CanHandleEvent(event))
+    return false;
+
+  ForwardExposeEvent(event);
+  return true;
+}
+
+}  // namespace ui