[mutter] cogl: GLES3 has sync objects

[Jonas Ådahl <jadahl src gnome org>]

commit 41992757e03f32608411bcc320c533fbffd02917
Author: Adam Jackson <ajax redhat com>
Date:   Tue Oct 22 18:55:11 2019 -0400

    cogl: GLES3 has sync objects
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/882

 cogl/cogl/driver/gl/gles/cogl-driver-gles.c  | 3 +++
 cogl/cogl/gl-prototypes/cogl-all-functions.h | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/cogl/cogl/driver/gl/gles/cogl-driver-gles.c b/cogl/cogl/driver/gl/gles/cogl-driver-gles.c
index 4d80e5c69..2f98b3bd8 100644
--- a/cogl/cogl/driver/gl/gles/cogl-driver-gles.c
+++ b/cogl/cogl/driver/gl/gles/cogl-driver-gles.c
@@ -366,6 +366,9 @@ _cogl_driver_update_features (CoglContext *context,
       _cogl_check_extension ("GL_OES_egl_sync", gl_extensions))
     COGL_FLAGS_SET (private_features, COGL_PRIVATE_FEATURE_OES_EGL_SYNC, TRUE);
 
+  if (context->glFenceSync)
+    COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_FENCE, TRUE);
+
   if (_cogl_check_extension ("GL_EXT_texture_rg", gl_extensions))
     COGL_FLAGS_SET (context->features,
                     COGL_FEATURE_ID_TEXTURE_RG,
diff --git a/cogl/cogl/gl-prototypes/cogl-all-functions.h b/cogl/cogl/gl-prototypes/cogl-all-functions.h
index 3dece02d8..a0c6395af 100644
--- a/cogl/cogl/gl-prototypes/cogl-all-functions.h
+++ b/cogl/cogl/gl-prototypes/cogl-all-functions.h
@@ -212,7 +212,7 @@ COGL_EXT_END ()
 
 #ifdef GL_ARB_sync
 COGL_EXT_BEGIN (sync, 3, 2,
-                0, /* not in either GLES */
+                COGL_EXT_IN_GLES3,
                 "ARB:\0",
                 "sync\0")
 COGL_EXT_FUNCTION (GLsync, glFenceSync,