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

build/common.gypi

 # 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 343 matching lines @@
     # Disable shadow stack keeping used by heapcheck to unwind the stacks
     # better.
     'linux_keep_shadow_stacks%': 0,
 
     # Set to 1 to turn on seccomp sandbox by default.
     # (Note: this is ignored for official builds.)
     'linux_use_seccomp_sandbox%': 0,
 
     # Set to 1 to link against libgnome-keyring instead of using dlopen().
     'linux_link_gnome_keyring%': 0,
+    # Set to 1 to link against gsettings APIs instead of using dlopen().
+    'linux_link_gsettings%': 0,
 
     # Used to disable Native Client at compile time, for platforms where it
     # isn't supported
     'disable_nacl%': 0,
 
     # Set Thumb compilation flags.
     'arm_thumb%': 0,
 
     # Set ARM fpu compilation flags (only meaningful if armv7==1 and
     # arm_neon==0).
@@ skipping 138 matching lines @@
       }],
 
       # Set the relative path from this file to the GYP file of the JPEG
       # library used by Chromium.
       ['use_libjpeg_turbo==1', {
         'libjpeg_gyp_path': '../third_party/libjpeg_turbo/libjpeg.gyp',
       }, {
         'libjpeg_gyp_path': '../third_party/libjpeg/libjpeg.gyp',
       }],  # use_libjpeg_turbo==1
 
-      # Use GConf, the GNOME configuration system.
+      # Options controlling the use of GConf (the classic GNOME configuration
+      # system) and GIO, which contains GSettings (the new GNOME config system).
       ['chromeos==1', {
         'use_gconf%': 0,
+        'use_gio%': 0,
       }, {
         'use_gconf%': 1,
+        'use_gio%': 1,
       }],
 
       # Set up -D and -E flags passed into grit.
       ['branding=="Chrome"', {
         # TODO(mmoss) The .grd files look for _google_chrome, but for
         # consistency they should look for google_chrome_build like C++.
         'grit_defines': ['-D', '_google_chrome',
                          '-E', 'CHROMIUM_BUILD=google_chrome'],
       }, {
         'grit_defines': ['-D', '_chromium',
@@ skipping 1199 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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