Mark NoOpGLSurface as surfaceless.

ui/gl/gl_surface_mac.cc

 // Copyright (c) 2012 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/gl/gl_surface.h"
 
 #include <OpenGL/CGLRenderers.h>
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
@@ skipping 22 matching lines @@
   virtual bool Initialize() override { return true; }
   virtual void Destroy() override {}
   virtual bool IsOffscreen() override { return true; }
   virtual bool SwapBuffers() override {
     NOTREACHED() << "Cannot call SwapBuffers on a NoOpGLSurface.";
     return false;
   }
   virtual gfx::Size GetSize() override { return size_; }
   virtual void* GetHandle() override { return NULL; }
   virtual void* GetDisplay() override { return NULL; }
+  virtual bool IsSurfaceless() const override { return true; }
 
  protected:
   virtual ~NoOpGLSurface() {}
 
  private:
   gfx::Size size_;
 
   DISALLOW_COPY_AND_ASSIGN(NoOpGLSurface);
 };
 
@@ skipping 99 matching lines @@
     }
     case kGLImplementationMockGL:
       return new GLSurfaceStub;
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 }  // namespace gfx