Implement AtkComponent interface for chrome UI.

ui/accessibility/platform/ax_platform_node_auralinux.h

Index: ui/accessibility/platform/ax_platform_node_auralinux.h
diff --git a/ui/accessibility/platform/ax_platform_node_auralinux.h b/ui/accessibility/platform/ax_platform_node_auralinux.h
index 8f86bc71d8d2bdfd9d377e3a064dc8a31a56f99a..07e6ecfc94b7d1c1b6406c3d75528265a85390a4 100644
--- a/ui/accessibility/platform/ax_platform_node_auralinux.h
+++ b/ui/accessibility/platform/ax_platform_node_auralinux.h
@@ -25,6 +25,10 @@ class AXPlatformNodeAuraLinux : public AXPlatformNodeBase {
   AtkRole GetAtkRole();
   void GetAtkState(AtkStateSet* state_set);
   void GetAtkRelations(AtkRelationSet* atk_relation_set);
+  void GetExtents(gint* x, gint* y, gint* width, gint* height,
+                  AtkCoordType coord_type);
+  void GetPosition(gint* x, gint* y, AtkCoordType coord_type);
+  void GetSize(gint* width, gint* height);
 
   // AXPlatformNode overrides.
   void Destroy() override;