Bug 1736621 - [X11][EGL] Ensure to use the same swap interval as on Wayland, r=stransky,gfx-reviewers,jgilbert

While no issues with these cases are known yet, there is no reason
why we would want this case to diverge between Wayland and X11.

Spotted by Darkspirit.

Differential Revision: https://phabricator.services.mozilla.com/D128910

gfx/gl/GLContextProviderEGL.cpp

@@ -307,9 +307,8 @@ already_AddRefed<GLContext> GLContextEGLFactory::CreateImpl(
   gl->MakeCurrent();
   gl->SetIsDoubleBuffered(doubleBuffered);
 
-#ifdef MOZ_GTK_WAYLAND
-  if (surface && GdkIsWaylandDisplay()) {
-    // Make eglSwapBuffers() non-blocking on wayland
+#ifdef MOZ_WIDGET_GTK
+  if (surface) {
     const int interval = gfxVars::SwapIntervalEGL() ? 1 : 0;
     egl->fSwapInterval(interval);
   }
@@ -500,10 +499,8 @@ bool GLContextEGL::RenewSurface(CompositorWidget* aWidget) {
   }
   const bool ok = MakeCurrent(true);
   MOZ_ASSERT(ok);
-#ifdef MOZ_GTK_WAYLAND
-  if (mSurface && GdkIsWaylandDisplay()) {
-    // The swap interval pref is false by default so that eglSwapBuffers()
-    // is non-blocking on wayland.
+#ifdef MOZ_WIDGET_GTK
+  if (mSurface) {
     const int interval = gfxVars::SwapIntervalEGL() ? 1 : 0;
     mEgl->fSwapInterval(interval);
   }