Expose html attributes in automation tree.

chrome/renderer/extensions/automation_internal_custom_bindings.h

Index: chrome/renderer/extensions/automation_internal_custom_bindings.h
diff --git a/chrome/renderer/extensions/automation_internal_custom_bindings.h b/chrome/renderer/extensions/automation_internal_custom_bindings.h
index bcca2ed96b8d3ae83532fe2d28a9029c77f96874..a6c8a4cc6e800254ba70fb20f60e2bd279c8f3ab 100644
--- a/chrome/renderer/extensions/automation_internal_custom_bindings.h
+++ b/chrome/renderer/extensions/automation_internal_custom_bindings.h
@@ -132,6 +132,10 @@ class AutomationInternalCustomBindings : public ObjectBackedNativeHandler,
   void GetChildIDAtIndex(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   // Args: int ax_tree_id, int node_id
+  // Returns: JS object with a map from html attribute key to value.
+  void GetHtmlAttributes(const v8::FunctionCallbackInfo<v8::Value>& args);
+
+  // Args: int ax_tree_id, int node_id
   // Returns: JS object with a string key for each state flag that's set.
   void GetState(const v8::FunctionCallbackInfo<v8::Value>& args);