Build OSMesa as a loadable_module so chrome does not link against it....

third_party/mesa/mesa.gyp

 # 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.
 
 {
   'variables': {
   },
+  'target_defaults': {
+    'conditions': [
+      ['OS=="linux"', {
+        'cflags': [
+          '-fPIC',
+        ],
+      }],
+    ],
+  },
   'targets': [
     {
       'target_name': 'mesa',
       'type': 'static_library',
       'include_dirs': [
         'MesaLib/include',
         'MesaLib/src/mesa',
       ],
       'sources': [
         'MesaLib/src/mesa/main/accum.c',
@@ skipping 399 matching lines @@
         'MesaLib/src/mesa/main/version.h',
         'MesaLib/src/mesa/main/viewport.h',
         'MesaLib/src/mesa/main/vtxfmt.h',
         'MesaLib/src/mesa/main/vtxfmt_tmp.h',
       ],
     },
     # Building this target will hide the native OpenGL shared library and
     # replace it with a slow software renderer.
     {
       'target_name': 'osmesa',
-      'type': 'shared_library',
+      'type': 'loadable_module',
+      'mac_bundle': 0,
       'dependencies': [
         'mesa',
       ],
       'include_dirs': [
         'MesaLib/include',
         'MesaLib/src/mesa',
         'MesaLib/src/mesa/drivers',
       ],
       'sources': [
         'MesaLib/src/mesa/drivers/common/driverfuncs.c',
         'MesaLib/src/mesa/drivers/common/driverfuncs.h',
         'MesaLib/src/mesa/drivers/common/meta.c',
         'MesaLib/src/mesa/drivers/common/meta.h',
         'MesaLib/src/mesa/drivers/osmesa/osmesa.c',
         'MesaLib/src/mesa/drivers/osmesa/osmesa.def',
       ],
     },
   ],
 }