Re-land: Resurrect Aura Linux accessibility.

ui/accessibility/accessibility.gyp

Index: ui/accessibility/accessibility.gyp
diff --git a/ui/accessibility/accessibility.gyp b/ui/accessibility/accessibility.gyp
index 88613e68505f8abaa77bcb7c0df1e4cc63e7af7a..e417f101ff568cfc210280572a02d8bb64046cf8 100644
--- a/ui/accessibility/accessibility.gyp
+++ b/ui/accessibility/accessibility.gyp
@@ -43,8 +43,12 @@
         'ax_tree_update.h',
         'ax_view_state.cc',
         'ax_view_state.h',
+        'platform/atk_util_auralinux.cc',
+        'platform/atk_util_auralinux.h',
         'platform/ax_platform_node.cc',
         'platform/ax_platform_node.h',
+        'platform/ax_platform_node_auralinux.cc',
+        'platform/ax_platform_node_auralinux.h',
         'platform/ax_platform_node_base.cc',
         'platform/ax_platform_node_base.h',
         'platform/ax_platform_node_delegate.h',
@@ -59,6 +63,27 @@
             '../../third_party/iaccessible2/iaccessible2.gyp:iaccessible2'
           ],
         }],
+        ['OS=="linux" and chromeos==0 and use_x11==1', {
+          'dependencies': [
+            '../../build/linux/system.gyp:atk',
+            '../../build/linux/system.gyp:gconf',
+            '../../build/linux/system.gyp:glib',
+          ],
+          'variables': {
+            'clang_warning_flags': [
+              # glib uses the pre-c++11 typedef-as-static_assert hack.
+              '-Wno-unused-local-typedefs',
+            ],
+          },
+        }],
+        ['OS!="linux" or chromeos==1 or use_x11==0', {
+          'sources!': [
+            'platform/ax_platform_node_auralinux.cc',
+            'platform/ax_platform_node_auralinux.h',
+            'platform/atk_util_auralinux.cc',
+            'platform/atk_util_auralinux.h',
+          ],
+        }],
       ],
     },
     {