Linux: add gyp rules for gio library and gsettings link mode.

build/linux/system.gyp

 # 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.
 
 {
   'conditions': [
     ['sysroot!=""', {
       'variables': {
         'pkg-config': './pkg-config-wrapper "<(sysroot)"',
       },
@@ skipping 194 matching lines @@
             'ldflags': [
               '<!@(<(pkg-config) --libs-only-L --libs-only-other gconf-2.0)',
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l gconf-2.0)',
             ],
           },
       }]]
     },
     {
+      'target_name': 'gio',
+      'type': 'settings',
+      'conditions': [
+        ['use_gio==1 and _toolset=="target"', {
+          'direct_dependent_settings': {
+            'cflags': [
+              '<!@(<(pkg-config) --cflags gio-2.0)',
+            ],
+            'defines': [
+              'USE_GIO',
+            ],
+            'conditions': [
+              ['linux_link_gsettings==0', {
+                'defines': ['DLOPEN_GSETTINGS'],
+              }],
+            ],
+          },
+          'link_settings': {
+            'ldflags': [
+              '<!@(<(pkg-config) --libs-only-L --libs-only-other gio-2.0)',
+            ],
+            'libraries': [
+              '<!@(<(pkg-config) --libs-only-l gio-2.0)',
+            ],
+            'conditions': [
+              ['linux_link_gsettings==0', {
+                'libraries': [
+                  '-ldl',
+                ],
+              }],
+            ],
+          },
+      }]]
+    },
+    {
       'target_name': 'x11',
       'type': 'settings',
       'conditions': [
         ['_toolset=="target"', {
           'direct_dependent_settings': {
             'cflags': [
               '<!@(<(pkg-config) --cflags x11)',
             ],
           },
           'link_settings': {
@@ skipping 164 matching lines @@
       ],
     },
   ],
 }
 
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