Linux: add option to link libpci directly instead of using dlopen.

content/content_gpu.gypi

 # Copyright (c) 2012 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': {
+    'linux_link_libpci%': 0,
+  },
   'dependencies': [
     '../base/base.gyp:base',
     '../skia/skia.gyp:skia',
     '../ui/gl/gl.gyp:gl',
   ],
   'sources': [
     'gpu/gpu_dx_diagnostics_win.cc',
     'gpu/gpu_info_collector_android.cc',
     'gpu/gpu_info_collector_linux.cc',
     'gpu/gpu_info_collector_mac.mm',
@@ skipping 87 matching lines @@
     ['target_arch=="arm" and chromeos == 1', {
       'include_dirs': [
         '<(DEPTH)/third_party/openmax/il',
       ],
     }],
     ['target_arch!="arm" and chromeos == 1', {
       'include_dirs': [
         '<(DEPTH)/third_party/libva',
       ],
     }],
+    ['linux_link_libpci==0', {
+      'defines': [
+        'DLOPEN_LIBPCI',
+      ],
+    }, { # linux_link_libpci==1
+      'cflags': [
+        '<!@(pkg-config --cflags libpci)',
+      ],
+      'link_settings': {
+        'ldflags': [
+          '<!@(pkg-config --libs-only-L --libs-only-other libpci)',
+        ],
+        'libraries': [
+          '<!@(pkg-config --libs-only-l libpci)',
+        ],
+      }
+    }],
   ],
 }