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

ui/gfx/gl/gl_implementation.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_implementation.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 
 namespace gfx {
 
 namespace {
 
 const struct {
   const char* name;
   GLImplementation implementation;
 } kGLImplementationNamePairs[] = {
   { kGLImplementationDesktopName, kGLImplementationDesktopGL },
   { kGLImplementationOSMesaName, kGLImplementationOSMesaGL },
+#if defined(OS_MACOSX)
+  { kGLImplementationAppleName, kGLImplementationAppleGL },
+#endif
   { kGLImplementationEGLName, kGLImplementationEGLGLES2 },
   { kGLImplementationMockName, kGLImplementationMockGL }
 };
 
 typedef std::vector<base::NativeLibrary> LibraryArray;
 
 GLImplementation g_gl_implementation = kGLImplementationNone;
 LibraryArray* g_libraries;
 GLGetProcAddressProc g_get_proc_address;
 
 void CleanupNativeLibraries(void* unused) {
   if (g_libraries) {
     for (LibraryArray::iterator it = g_libraries->begin();
          it != g_libraries->end(); ++it) {
       base::UnloadNativeLibrary(*it);
     }
     delete g_libraries;
     g_libraries = NULL;
   }
 }
 
 bool ExportsCoreFunctionsFromGetProcAddress(GLImplementation implementation) {
   switch (GetGLImplementation()) {
     case kGLImplementationDesktopGL:
     case kGLImplementationOSMesaGL:
+    case kGLImplementationAppleGL:
     case kGLImplementationMockGL:
       return true;
     case kGLImplementationEGLGLES2:
       return false;
     default:
       NOTREACHED();
       return true;
   }
 }
 
@@ skipping 20 matching lines @@
 void SetGLImplementation(GLImplementation implementation) {
   g_gl_implementation = implementation;
 }
 
 GLImplementation GetGLImplementation() {
   return g_gl_implementation;
 }
 
 bool HasDesktopGLFeatures() {
   return kGLImplementationDesktopGL == g_gl_implementation ||
-         kGLImplementationOSMesaGL == g_gl_implementation;
+         kGLImplementationOSMesaGL == g_gl_implementation ||
+         kGLImplementationAppleGL == g_gl_implementation;
 }
 
 void AddGLNativeLibrary(base::NativeLibrary library) {
   DCHECK(library);
 
   if (!g_libraries) {
     g_libraries = new LibraryArray;
     base::AtExitManager::RegisterCallback(CleanupNativeLibraries, NULL);
   }
 
@@ skipping 37 matching lines @@
   if (!proc && g_get_proc_address) {
     proc = g_get_proc_address(name);
     if (proc)
       return proc;
   }
 
   return proc;
 }
 
 }  // namespace gfx