This change adds the apple software renderer as an option on Chrome/Mac. It's enabled by passing...

ui/gfx/gl/gl_surface_mac.cc

 // Copyright (c) 2011 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/gfx/gl/gl_surface.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/mesa/MesaLib/include/GL/osmesa.h"
 #include "ui/gfx/gl/gl_bindings.h"
 #include "ui/gfx/gl/gl_implementation.h"
 #include "ui/gfx/gl/gl_surface_cgl.h"
 #include "ui/gfx/gl/gl_surface_osmesa.h"
 #include "ui/gfx/gl/gl_surface_stub.h"
 
 #if defined(USE_AURA)
 #include "ui/gfx/gl/gl_surface_nsview.h"
 #endif
 
 namespace gfx {
 
 bool GLSurface::InitializeOneOffInternal() {
   switch (GetGLImplementation()) {
     case kGLImplementationDesktopGL:
+    case kGLImplementationAppleGL:
       if (!GLSurfaceCGL::InitializeOneOff()) {
         LOG(ERROR) << "GLSurfaceCGL::InitializeOneOff failed.";
         return false;
       }
       break;
     default:
       break;
   }
   return true;
 }
 
 scoped_refptr<GLSurface> GLSurface::CreateViewGLSurface(
     bool software,
     gfx::PluginWindowHandle window) {
 #if defined(USE_AURA)
   if (software)
     return NULL;
 
   switch (GetGLImplementation()) {
-    case kGLImplementationDesktopGL: {
+    case kGLImplementationDesktopGL:
+    case kGLImplementationAppleGL: {
       scoped_refptr<GLSurface> surface(new GLSurfaceNSView(window));
       if (!surface->Initialize())
         return NULL;
 
       return surface;
     }
     case kGLImplementationMockGL:
       return new GLSurfaceStub;
     default:
       NOTREACHED();
@@ skipping 12 matching lines @@
 
   switch (GetGLImplementation()) {
     case kGLImplementationOSMesaGL: {
       scoped_refptr<GLSurface> surface(new GLSurfaceOSMesa(OSMESA_RGBA,
                                                            size));
       if (!surface->Initialize())
         return NULL;
 
       return surface;
     }
-    case kGLImplementationDesktopGL: {
+    case kGLImplementationDesktopGL:
+    case kGLImplementationAppleGL: {
       scoped_refptr<GLSurface> surface(new PbufferGLSurfaceCGL(size));
       if (!surface->Initialize())
         return NULL;
 
       return surface;
     }
     case kGLImplementationMockGL:
       return new GLSurfaceStub;
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 }  // namespace gfx