Fixed case with no GLImage.

gpu/ipc/service/image_transport_surface_overlay_mac.mm

Index: gpu/ipc/service/image_transport_surface_overlay_mac.mm
diff --git a/gpu/ipc/service/image_transport_surface_overlay_mac.mm b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
index af6c63211e11f95b6d89296d6d408d411eb2a6ef..0c38129c29c672b586d0c9913b931f4b0063224a 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.mm
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
@@ -332,11 +332,13 @@ bool ImageTransportSurfaceOverlayMac::ScheduleOverlayPlane(
 
 bool ImageTransportSurfaceOverlayMac::ScheduleCALayer(
     const ui::CARendererLayerParams& params) {
-  gl::GLImageIOSurface* io_surface_image =
-      gl::GLImageIOSurface::FromGLImage(params.image);
-  if (!io_surface_image) {
-    DLOG(ERROR) << "Cannot schedule CALayer with non-IOSurface GLImage";
-    return false;
+  if (params.image) {
+    gl::GLImageIOSurface* io_surface_image =
+        gl::GLImageIOSurface::FromGLImage(params.image);
+    if (!io_surface_image) {
+      DLOG(ERROR) << "Cannot schedule CALayer with non-IOSurface GLImage";
+      return false;
+    }
   }
   return ca_layer_tree_coordinator_->GetPendingCARendererLayerTree()
       ->ScheduleCALayer(params);