Fixed case with no GLImage.

gpu/ipc/service/image_transport_surface_overlay_mac.mm

 // Copyright 2015 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 "gpu/ipc/service/image_transport_surface_overlay_mac.h"
 
 #include <CoreGraphics/CoreGraphics.h>
 #include <IOSurface/IOSurface.h>
 #include <OpenGL/CGLRenderers.h>
 #include <OpenGL/CGLTypes.h>
@@ skipping 314 matching lines @@
   if (!io_surface_image) {
     DLOG(ERROR) << "Not an IOSurface image.";
     return false;
   }
   return ca_layer_tree_coordinator_->SetPendingGLRendererBackbuffer(
       io_surface_image->io_surface());
 }
 
 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);
 }
 
 void ImageTransportSurfaceOverlayMac::ScheduleCALayerInUseQuery(
     std::vector<CALayerInUseQuery> queries) {
   ca_layer_in_use_queries_.swap(queries);
 }
 
@@ skipping 26 matching lines @@
   gl_renderer_id_ = context_renderer_id & kCGLRendererIDMatchingMask;
 
   // Post a task holding a reference to the new GL context. The reason for
   // this is to avoid creating-then-destroying the context for every image
   // transport surface that is observing the GPU switch.
   base::MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&IOSurfaceContextNoOp, context_on_new_gpu));
 }
 
 }  // namespace gpu