Support dynamic switching between integrated and discrete GPUs on Mac OS X.

content/common/sandbox_mac.mm

 // 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 "content/common/sandbox_mac.h"
 
 #import <Cocoa/Cocoa.h>
-#import <OpenGL/OpenGL.h>
 
 extern "C" {
 #include <sandbox.h>
 }
 #include <signal.h>
 #include <sys/param.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 224 matching lines @@
   }
 
   {
     // Allow access to /dev/urandom.
     GetUrandomFD();
   }
 
   // Process-type dependent warm-up.
   switch (sandbox_type) {
     case SANDBOX_TYPE_GPU:
-      {  // GPU-related stuff is very slow without this, probably because
-         // the sandbox prevents loading graphics drivers or some such.
-         CGLPixelFormatAttribute attribs[] = { (CGLPixelFormatAttribute)0 };
-         CGLPixelFormatObj format;
-         GLint n;
-         CGLChoosePixelFormat(attribs, &format, &n);
-         if (format)
-           CGLReleasePixelFormat(format);
-      }
-
       {
          // Preload either the desktop GL or the osmesa so, depending on the
          // --use-gl flag.
          gfx::GLSurface::InitializeOneOff();
       }
       break;
 
     default:
       // To shut up a gcc warning.
       break;
@@ skipping 308 matching lines @@
   if (HANDLE_EINTR(fcntl(fd, F_GETPATH, canonical_path)) != 0) {
     PLOG(FATAL) << "GetCanonicalSandboxPath() failed for: "
                 << path->value();
     return;
   }
 
   *path = FilePath(canonical_path);
 }
 
 }  // namespace sandbox