Re-land: Resurrect Aura Linux accessibility.

ui/accessibility/platform/atk_util_auralinux.cc

Index: ui/accessibility/platform/atk_util_auralinux.cc
diff --git a/ui/accessibility/platform/atk_util_auralinux.cc b/ui/accessibility/platform/atk_util_auralinux.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a15df08137d874609305f90a6bca6e5c15e5c213
--- /dev/null
+++ b/ui/accessibility/platform/atk_util_auralinux.cc
@@ -0,0 +1,161 @@
+// Copyright 2015 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.
+
+#include <atk/atk.h>
+#include <gconf/gconf-client.h>
+#include <glib-2.0/gmodule.h>
+
+#include "base/files/file_path.h"
+#include "base/logging.h"
+#include "base/memory/singleton.h"
+#include "ui/accessibility/platform/atk_util_auralinux.h"
+#include "ui/accessibility/platform/ax_platform_node_auralinux.h"
+
+namespace {
+
+const char kGnomeAccessibilityEnabledKey[] =
+    "/desktop/gnome/interface/accessibility";
+
+bool ShouldEnableAccessibility() {
+  GConfClient* client = gconf_client_get_default();
+  if (!client) {
+    LOG(ERROR) << "gconf_client_get_default failed";
+    return false;
+  }
+
+  GError* error = nullptr;
+  gboolean value = gconf_client_get_bool(client,
+                                         kGnomeAccessibilityEnabledKey,
+                                         &error);
+  if (error) {
+    VLOG(1) << "gconf_client_get_bool failed";
+    g_error_free(error);
+    g_object_unref(client);
+    return false;
+  }
+
+  g_object_unref(client);
+  return value;
+}
+
+}  // namespace
+
+G_BEGIN_DECLS
+
+//
+// atk_util_auralinux AtkObject definition and implementation.
+//
+
+#define ATK_UTIL_AURALINUX_TYPE (atk_util_auralinux_get_type())
+#define ATK_UTIL_AURALINUX(obj) \
+    (G_TYPE_CHECK_INSTANCE_CAST((obj), \
+     ATK_UTIL_AURALINUX_TYPE, \
+     AtkUtilAuraLinux))
+#define ATK_UTIL_AURALINUX_CLASS(klass) \
+    (G_TYPE_CHECK_CLASS_CAST((klass), \
+                             ATK_UTIL_AURALINUX_TYPE, \
+                             AtkUtilAuraLinuxClass))
+#define IS_ATK_UTIL_AURALINUX(obj) \
+    (G_TYPE_CHECK_INSTANCE_TYPE((obj), ATK_UTIL_AURALINUX_TYPE))
+#define IS_ATK_UTIL_AURALINUX_CLASS(klass) \
+    (G_TYPE_CHECK_CLASS_TYPE((klass), ATK_UTIL_AURALINUX_TYPE))
+#define ATK_UTIL_AURALINUX_GET_CLASS(obj) \
+    (G_TYPE_INSTANCE_GET_CLASS((obj), \
+                               ATK_UTIL_AURALINUX_TYPE, \
+                               AtkUtilAuraLinuxClass))
+
+typedef struct _AtkUtilAuraLinux        AtkUtilAuraLinux;
+typedef struct _AtkUtilAuraLinuxClass   AtkUtilAuraLinuxClass;
+
+struct _AtkUtilAuraLinux
+{
+  AtkUtil parent;
+};
+
+struct _AtkUtilAuraLinuxClass
+{
+  AtkUtilClass parent_class;
+};
+
+GType atk_util_auralinux_get_type();
+
+G_DEFINE_TYPE(AtkUtilAuraLinux, atk_util_auralinux, ATK_TYPE_UTIL);
+
+static void atk_util_auralinux_init(AtkUtilAuraLinux *ax_util) {
+}
+
+static AtkObject* atk_util_auralinux_get_root() {
+  ui::AXPlatformNode* application = ui::AXPlatformNodeAuraLinux::application();
+  if (application) {
+    return application->GetNativeViewAccessible();
+  }
+  return nullptr;
+}
+
+static G_CONST_RETURN gchar* atk_util_auralinux_get_toolkit_name(void) {
+  return "Chromium";
+}
+
+static G_CONST_RETURN gchar* atk_util_auralinux_get_toolkit_version(void) {
+  return "1.0";
+}
+
+static void atk_util_auralinux_class_init(AtkUtilAuraLinuxClass *klass) {
+  AtkUtilClass *atk_class;
+  gpointer data;
+
+  data = g_type_class_peek(ATK_TYPE_UTIL);
+  atk_class = ATK_UTIL_CLASS(data);
+
+  atk_class->get_root = atk_util_auralinux_get_root;
+  atk_class->get_toolkit_name = atk_util_auralinux_get_toolkit_name;
+  atk_class->get_toolkit_version = atk_util_auralinux_get_toolkit_version;
+}
+
+G_END_DECLS
+
+//
+// AtkUtilAuraLinuxClass implementation.
+//
+
+namespace ui {
+
+// static
+AtkUtilAuraLinux* AtkUtilAuraLinux::GetInstance() {
+  return Singleton<AtkUtilAuraLinux>::get();
+}
+
+AtkUtilAuraLinux::AtkUtilAuraLinux() {
+  // Register our util class.
+  g_type_class_unref(g_type_class_ref(ATK_UTIL_AURALINUX_TYPE));
+
+  if (!ShouldEnableAccessibility()) {
+    VLOG(1) << "Will not enable ATK accessibility support.";
+    return;
+  }
+
+  VLOG(1) << "Enabling ATK accessibility support.";
+
+  // Try to load libatk-bridge.so.
+  base::FilePath atk_bridge_path(ATK_LIB_DIR);
+  atk_bridge_path = atk_bridge_path.Append("gtk-2.0/modules/libatk-bridge.so");
+  GModule* bridge = g_module_open(atk_bridge_path.value().c_str(),
+                                  static_cast<GModuleFlags>(0));
+  if (!bridge) {
+    VLOG(1) << "Unable to open module " << atk_bridge_path.value();
+    return;
+  }
+
+  // Try to call gnome_accessibility_module_init from libatk-bridge.so.
+  void (*gnome_accessibility_module_init)();
+  if (g_module_symbol(bridge, "gnome_accessibility_module_init",
+                      (gpointer *)&gnome_accessibility_module_init)) {
+    (*gnome_accessibility_module_init)();
+  }
+}
+
+AtkUtilAuraLinux::~AtkUtilAuraLinux() {
+}
+
+}  // namespace ui