ozone: Implement zero/one-copy texture for Ozone GBM.

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. It should theoretically be in the
 # src/ui directory and only things that depend on the ui module should get the
 # definitions.
 #
 # However, today we have many "bad" dependencies on some of these flags from,
 # e.g. base, so they need to be global.
@@ skipping 17 matching lines @@
   use_aura = is_win || is_linux
 
   # True means the UI is built using the "views" framework.
   toolkit_views = is_mac || is_win || is_chromeos || use_aura
 
   # Whether the entire browser uses toolkit-views on Mac instead of Cocoa.
   mac_views_browser = false
 
   # Whether we should use glib, a low level C utility library.
   use_glib = is_linux && !use_ozone
+
+  # Whether Ozone platforms include gbm.
+  ozone_platform_gbm = false

[spang, 2015/05/11 15:44:58]

It's not acceptable to put this here. We don't want the enabled platforms to
leak outside of the ui/ozone component.

Please use the ui/ozone/public interface in USE_OZONE builds (and change it if
necessary).

[dshwang, 2015/05/14 12:25:46]

Done.

 }
 
 # Additional dependent variables -----------------------------------------------
 #
 # These variables depend on other variables and can't be set externally.
 
 if (is_linux && use_glib) {
   use_cairo = true
   use_pango = true
 } else {
   use_cairo = false
   use_pango = false
 }
 
 # Use GPU accelerated cross process image transport by default on linux builds
 # with the Aura window manager.
 ui_compositor_image_transport = use_aura && is_linux
 
 use_default_render_theme = use_aura || is_linux
 
 # Indicates if the UI toolkit depends on X11.
 use_x11 = is_linux && !use_ozone
 
 use_ozone_evdev = use_ozone
 
 use_clipboard_aurax11 = is_linux && use_aura && use_x11
 
 enable_hidpi = is_mac || is_chromeos || is_win || is_linux