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

Index: ui/gfx/gl/gl_surface_mac.cc
===================================================================
--- ui/gfx/gl/gl_surface_mac.cc	(revision 113194)
+++ ui/gfx/gl/gl_surface_mac.cc	(working copy)
@@ -22,6 +22,7 @@
 bool GLSurface::InitializeOneOffInternal() {
   switch (GetGLImplementation()) {
     case kGLImplementationDesktopGL:
+    case kGLImplementationAppleGL:
       if (!GLSurfaceCGL::InitializeOneOff()) {
         LOG(ERROR) << "GLSurfaceCGL::InitializeOneOff failed.";
         return false;
@@ -41,7 +42,8 @@
     return NULL;
 
   switch (GetGLImplementation()) {
-    case kGLImplementationDesktopGL: {
+    case kGLImplementationDesktopGL:
+    case kGLImplementationAppleGL: {
       scoped_refptr<GLSurface> surface(new GLSurfaceNSView(window));
       if (!surface->Initialize())
         return NULL;
@@ -74,7 +76,8 @@
 
       return surface;
     }
-    case kGLImplementationDesktopGL: {
+    case kGLImplementationDesktopGL:
+    case kGLImplementationAppleGL: {
       scoped_refptr<GLSurface> surface(new PbufferGLSurfaceCGL(size));
       if (!surface->Initialize())
         return NULL;