Re-land: chrome: Add support for use_glib=true to wayland server.

build/config/ui.gni

 # Copyright 2014 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.
 
 # This file contains UI-related build flags (see features.gni for Chrome
 # feature-related ones). These should theoretically be moved to the ui
 # directory.
 #
 # However, today we have many "bad" dependencies on some of these flags from,
 # e.g. base, so they need to be global to match the GYP configuration. Also,
@@ skipping 51 matching lines @@
 use_default_render_theme = use_aura && !is_android
 
 # Indicates if the UI toolkit depends on X11.
 use_x11 = is_linux && !use_ozone
 
 # Turn off glib if Ozone is enabled.
 if (use_ozone) {
   use_glib = false
 }
 
-# Turn off Wayland if glib is enabled.
-if (use_glib) {

[jochen (gone - plz use gerrit), 2015/12/01 13:45:22]

where's the corresponding gypi change?

[reveman, 2015/12/01 16:53:02]

Gyp build didn't force enable_wayland_server to 0 when use_glib=1. Gyp build
just enabled wayland_server if 'chromeos==1 and use_ozone==1', which implied
use_glib=0 by default and you could always override it if you knew what you were
doing.

https://code.google.com/p/chromium/codesearch#chromium/src/build/common.gypi&...

The main reason this was different is because how we set use_glib=false in GN
build files.

Now that use_glib doesn't matter anymore, GN and gyp configs can easily have
matching logic. I updated latest patch to simply set enable_wayland_server to
true by default when chromeos=1 for both GN and gyp.

-  enable_wayland_server = false
-}
-
 if (is_linux && !use_ozone) {
   use_cairo = true
   use_pango = true
 } else {
   use_cairo = false
   use_pango = false
 }
 
 # Whether to use atk, the Accessibility ToolKit library
 use_atk = is_desktop_linux && use_x11
 
 use_clipboard_aurax11 = is_linux && use_aura && use_x11
 
 enable_hidpi = is_mac || is_win || is_linux
 
 enable_topchrome_md = is_chromeos || is_win || is_linux