Implement AutomationNode.querySelector().

chrome/common/extensions/api/automation_internal.idl

Index: chrome/common/extensions/api/automation_internal.idl
diff --git a/chrome/common/extensions/api/automation_internal.idl b/chrome/common/extensions/api/automation_internal.idl
index 9c2a08993c3e9d7e0499f45fde61a3258d0da225..7b9063fe718cacb16b8b4a17dd55d990133e72fd 100644
--- a/chrome/common/extensions/api/automation_internal.idl
+++ b/chrome/common/extensions/api/automation_internal.idl
@@ -81,6 +81,13 @@ namespace automationInternal {
     long endIndex;
   };
 
+  // Arguments for the querySelector function.
+  dictionary QuerySelectorRequiredParams {
+    long treeID;
+    long automationNodeID;
+    DOMString selector;
+  };
+
   // Returns the accessibility tree id of the web contents who's accessibility
   // was enabled using enableTab().
   callback EnableTabCallback = void(long tree_id);
@@ -88,6 +95,9 @@ namespace automationInternal {
   // Callback called when enableDesktop() returns.
   callback EnableDesktopCallback = void();
 
+  // Callback called when querySelector() returns.
+  callback QuerySelectorCallback = void(long resultAutomationNodeID);
+
   interface Functions {
     // Enable automation of the tab with the given id, or the active tab if no
     // tab id is given, and retrieves accessibility tree id for use in
@@ -103,6 +113,10 @@ namespace automationInternal {
     // Performs an action on an automation node.
     static void performAction(PerformActionRequiredParams args,
                               object opt_args);
+
+    // Performs a query selector query.
+    static void querySelector(QuerySelectorRequiredParams args,
+                              QuerySelectorCallback callback);
   };
 
   interface Events {