(Re-landing http://codereview.chromium.org/5991003)

chrome/common/sandbox_init_wrapper_mac.cc

 // Copyright (c) 2010 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 "chrome/common/sandbox_init_wrapper.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/sandbox_mac.h"
 
 bool SandboxInitWrapper::InitializeSandbox(const CommandLine& command_line,
                                            const std::string& process_type) {
   using sandbox::Sandbox;
 
   if (command_line.HasSwitch(switches::kNoSandbox))
     return true;
 
   Sandbox::SandboxProcessType sandbox_process_type;
   FilePath allowed_dir;  // Empty by default.
 
   if (process_type.empty()) {
     // Browser process isn't sandboxed.
     return true;
   } else if (process_type == switches::kRendererProcess) {
-    if (!command_line.HasSwitch(switches::kDisableExperimentalWebGL) &&
+    if (!command_line.HasSwitch(switches::kDisable3DAPIs) &&
+        !command_line.HasSwitch(switches::kDisableExperimentalWebGL) &&
         command_line.HasSwitch(switches::kInProcessWebGL)) {
       // TODO(kbr): this check seems to be necessary only on this
       // platform because the sandbox is initialized later. Remove
       // this once this flag is removed.
       return true;
     } else {
       sandbox_process_type = Sandbox::SANDBOX_TYPE_RENDERER;
     }
   } else if (process_type == switches::kExtensionProcess) {
     // Extension processes are just renderers [they use RenderMain()] with a
@@ skipping 27 matching lines @@
     NOTREACHED();
     return true;
   }
 
   // Warm up APIs before turning on the sandbox.
   Sandbox::SandboxWarmup(sandbox_process_type);
 
   // Actually sandbox the process.
   return Sandbox::EnableSandbox(sandbox_process_type, allowed_dir);
 }