ATK accessibility support for web content on Aura Linux.

build/config/linux/BUILD.gn

Index: build/config/linux/BUILD.gn
diff --git a/build/config/linux/BUILD.gn b/build/config/linux/BUILD.gn
index 202fd731897a89f29addd715f1c1150b751dde3c..8594f1ed91c28b4e50ccd55216bd35c1713ff188 100644
--- a/build/config/linux/BUILD.gn
+++ b/build/config/linux/BUILD.gn
@@ -132,6 +132,32 @@ if (!is_chromeos) {
   # If these extra checks are not run, gconf is required when building host
   # tools for a CrOS build.
   if (current_toolchain == default_toolchain) {
+    pkg_config("atk") {
+      packages = [ "atk" ]
+      atk_lib_dir = exec_script(pkg_config_script,
+                                [
+                                  "--libdir",
+                                  "atk",
+                                ],
+                                "string")
+      defines = [ "ATK_LIB_DIR=\"$atk_lib_dir\"" ]
+    }
+
+    # gn orders flags on a target before flags from configs. The default config
+    # adds -Wall, and these flags have to be after -Wall -- so they need to
+    # come from a config and can't be on the target directly.
+    config("atk_warnings") {
+      cflags = [
+        # glib uses the pre-c++11 typedef-as-static_assert hack.
+        "-Wno-unused-local-typedef",
+
+        # G_DEFINE_TYPE automatically generates a *get_instance_private
+        # inline function after glib 2.37. That's unused. Prevent to
+        # complain about it.
+        "-Wno-unused-function",
+      ]
+    }
+
     pkg_config("gconf") {
       packages = [ "gconf-2.0" ]
       defines = [ "USE_GCONF" ]