Fixed case with no GLImage.

ui/accelerated_widget_mac/ca_renderer_layer_tree.mm

 // 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/accelerated_widget_mac/ca_renderer_layer_tree.h"
 
 #include <AVFoundation/AVFoundation.h>
 #include <CoreMedia/CoreMedia.h>
 #include <CoreVideo/CoreVideo.h>
 #include <GLES2/gl2extchromium.h>
@@ skipping 376 matching lines @@
     if (current_layer.transform == params.transform)
       needs_new_transform_layer = false;
   }
   if (needs_new_transform_layer)
     transform_layers.push_back(TransformLayer(params.transform));
   transform_layers.back().AddContentLayer(params);
 }
 
 void CARendererLayerTree::TransformLayer::AddContentLayer(
     const CARendererLayerParams& params) {
-  gl::GLImageIOSurface* io_surface_image =
-      gl::GLImageIOSurface::FromGLImage(params.image);
-  DCHECK(io_surface_image);
-  base::ScopedCFTypeRef<IOSurfaceRef> io_surface =
-      io_surface_image->io_surface();
-  base::ScopedCFTypeRef<CVPixelBufferRef> cv_pixel_buffer =
-      io_surface_image->cv_pixel_buffer();
+  base::ScopedCFTypeRef<IOSurfaceRef> io_surface;
+  base::ScopedCFTypeRef<CVPixelBufferRef> cv_pixel_buffer;
+  if (params.image) {
+    gl::GLImageIOSurface* io_surface_image =
+        gl::GLImageIOSurface::FromGLImage(params.image);
+    DCHECK(io_surface_image);
+    io_surface = io_surface_image->io_surface();
+    cv_pixel_buffer = io_surface_image->cv_pixel_buffer();
+  }
 
   content_layers.push_back(
       ContentLayer(io_surface, cv_pixel_buffer, params.contents_rect,
                    params.rect, params.background_color, params.edge_aa_mask,
                    params.opacity, params.filter));
 }
 
 void CARendererLayerTree::RootLayer::CommitToCA(CALayer* superlayer,
                                                 RootLayer* old_layer,
                                                 float scale_factor) {
@@ skipping 206 matching lines @@
     } else {
       // Grey represents a CALayer that has not changed.
       color.reset(CGColorCreateGenericRGB(0.5, 0.5, 0.5, 1));
     }
     [ca_layer setBorderWidth:1];
     [ca_layer setBorderColor:color];
   }
 }
 
 }  // namespace ui