caopengllayer: don't use GCD to fetch the OpenGL context

This fails in one of three attempts in Webkit and even more often in Gecko browsers

modules/video_output/caopengllayer.m

@@ -142,11 +142,12 @@ static int Open (vlc_object_t *p_this)
     /* store for later, released in Close() */
     sys->container = [container retain];
 
-	dispatch_sync(dispatch_get_main_queue(), ^{
     [CATransaction begin];
     sys->cgLayer = [[VLCCAOpenGLLayer alloc] init];
     [sys->cgLayer setVoutDisplay:vd];
-		[sys->cgLayer display];		// TODO: Find a better way to wait until we get a context
+
+    [sys->cgLayer performSelectorOnMainThread:@selector(display) withObject:nil waitUntilDone:YES];
+
     if ([container respondsToSelector:@selector(addVoutLayer:)]) {
         msg_Dbg(vd, "container implements implicit protocol");
         [container addVoutLayer:sys->cgLayer];
@@ -157,17 +158,16 @@ static int Open (vlc_object_t *p_this)
         msg_Err(vd, "Provided NSObject container isn't compatible");
         [sys->cgLayer release];
         sys->cgLayer = nil;
+        [CATransaction commit];
+        goto bailout;
     }
     [CATransaction commit];
-	});
 
     if (!sys->cgLayer)
         goto bailout;
 
-    if (!sys->glContext) {
-        msg_Err(vd, "Have no gl context");
-        goto bailout;
-    }
+    if (!sys->glContext)
+        msg_Warn(vd, "we might not have an OpenGL context yet");
 
     /* Initialize common OpenGL video display */
     sys->gl.lock = OpenglLock;
@@ -335,6 +335,10 @@ static int Control (vout_display_t *vd, int query, va_list ap)
             *gl = &sys->gl;
             return VLC_SUCCESS;
         }
+        case VOUT_DISPLAY_CHANGE_WINDOW_STATE:
+        {
+            return VLC_SUCCESS;
+        }
 
         case VOUT_DISPLAY_RESET_PICTURES:
             assert (0);
@@ -418,9 +422,9 @@ static void *OurGetProcAddress (vlc_gl_t *gl, const char *name)
 {
     [super resizeWithOldSuperlayerSize: size];
 
-    CGRect bounds = self.bounds;
+    CGSize boundsSize = self.bounds.size;
     if (_vd)
-        vout_display_SendEventDisplaySize(_vd, bounds.size.width, bounds.size.height, _vd->cfg->is_fullscreen);
+        vout_display_SendEventDisplaySize(_vd, boundsSize.width, boundsSize.height, _vd->cfg->is_fullscreen);
 }
 
 - (BOOL)canDrawInCGLContext:(CGLContextObj)glContext pixelFormat:(CGLPixelFormatObj)pixelFormat forLayerTime:(CFTimeInterval)timeInterval displayTime:(const CVTimeStamp *)timeStamp