Make it possible to disable dbus on linux

build/common.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.
 
 # 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 107 matching lines @@
             'toolkit_views%': 0,
           }],
 
           # Set toolkit_uses_gtk for the Chromium browser on Linux.
           ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris") and use_aura==0', {
             'toolkit_uses_gtk%': 1,
           }, {
             'toolkit_uses_gtk%': 0,
           }],
 
+          # Whether or not to use D-Bus for core functionality on linux.
+          # (eg use_gconf=1 will still pull in dbus as a dependency).
+          ['OS=="linux"', {
+            'use_dbus%': 1,
+          }, {
+            'use_dbus%': 0,
+          }],
+
           # Enable HiDPI on Mac OS and Chrome OS.
           ['OS=="mac" or chromeos==1', {
             'enable_hidpi%': 1,
           }],
 
           # Enable touch UI on Metro.
           ['OS=="win"', {
             'enable_touch_ui%': 1,
           }],
 
@@ skipping 30 matching lines @@
       'use_openssl%': '<(use_openssl)',
       'enable_viewport%': '<(enable_viewport)',
       'enable_hidpi%': '<(enable_hidpi)',
       'enable_touch_ui%': '<(enable_touch_ui)',
       'android_build_type%': '<(android_build_type)',
       'google_tv%': '<(google_tv)',
       'enable_app_list%': '<(enable_app_list)',
       'enable_message_center%': '<(enable_message_center)',
       'use_default_render_theme%': '<(use_default_render_theme)',
       'buildtype%': '<(buildtype)',
+      'use_dbus%': '<(use_dbus)',
 
       # Override branding to select the desired branding flavor.
       'branding%': 'Chromium',
 
       # This variable tells WebCore.gyp and JavaScriptCore.gyp whether they are
       # are built under a chromium full build (1) or a webkit.org chromium
       # build (0).
       'inside_chromium_build%': 1,
 
       # Set to 1 to enable fast builds. It disables debug info for fastest
@@ skipping 568 matching lines @@
     'enable_message_center%': '<(enable_message_center)',
     'use_default_render_theme%': '<(use_default_render_theme)',
     'enable_settings_app%': '<(enable_settings_app)',
     'use_official_google_api_keys%': '<(use_official_google_api_keys)',
     'google_api_key%': '<(google_api_key)',
     'google_default_client_id%': '<(google_default_client_id)',
     'google_default_client_secret%': '<(google_default_client_secret)',
     'enable_managed_users%': '<(enable_managed_users)',
     'spdy_proxy_auth_origin%': '<(spdy_proxy_auth_origin)',
     'spdy_proxy_auth_property%': '<(spdy_proxy_auth_property)',
+    'use_dbus%': '<(use_dbus)',
 
     # Use system ffmpeg instead of bundled one.
     'use_system_ffmpeg%': 0,
 
     # Use system mesa instead of bundled one.
     'use_system_mesa%': 0,
 
     # Use system nspr instead of the bundled one.
     'use_system_nspr%': 0,
 
@@ skipping 3349 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }