Ozone integration.

ui/ozone/ozone.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.
+
+declare_args() {
+  # Select platforms automatically. Turn this off for manual control.
+  ozone_auto_platforms = false
+}
+
+declare_args() {
+  # The platform that will be active by default.
+  ozone_platform = ""
+
+  # Enable individual platforms.
+  ozone_platform_caca = false
+  ozone_platform_dri = false
+  ozone_platform_drm = false
+  ozone_platform_egltest = true
+  ozone_platform_gbm = true
+  ozone_platform_test = false
+
+  if (ozone_auto_platforms) {
+    # Use test as the default platform.
+    ozone_platform = "test"
+
+    # Build all platforms whose deps are in install-build-deps.sh.
+    # Only these platforms will be compile tested by buildbots.
+    ozone_platform_dri = true
+    ozone_platform_drm = true
+    ozone_platform_test = true
+    ozone_platform_egltest = true
+  }
+}