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

ui/gfx/gl/gl_context.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 <string>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/threading/thread_local.h"
@@ skipping 58 matching lines @@
   return share_group_.get();
 }
 
 bool GLContext::LosesAllContextsOnContextLost() {
   switch (GetGLImplementation()) {
     case kGLImplementationDesktopGL:
       return false;
     case kGLImplementationEGLGLES2:
       return true;
     case kGLImplementationOSMesaGL:
+    case kGLImplementationAppleGL:
       return false;
     case kGLImplementationMockGL:
       return false;
     default:
       NOTREACHED();
       return true;
   }
 }
 
 GLContext* GLContext::GetCurrent() {
@@ skipping 14 matching lines @@
   static bool initialized = false;
   if (initialized)
     return initialized;
   initialized = InitializeGLExtensionBindings(GetGLImplementation(), this);
   if (!initialized)
     LOG(ERROR) << "Could not initialize extension bindings.";
   return initialized;
 }
 
 }  // namespace gfx