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 7f70f84f22ecc0f2177e54e2e6edce3369409b67..14c168e424a79153179296ff97365706387ef430 100644
--- a/ui/accessibility/platform/ax_platform_node_auralinux.h
+++ b/ui/accessibility/platform/ax_platform_node_auralinux.h
@@ -34,6 +34,10 @@ 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;