Implement AutomationNode.querySelector().

extensions/common/extension_messages.h

 // Copyright 2014 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.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
@@ skipping 240 matching lines @@
   ExtensionMsg_PermissionSetStruct active_permissions;
   ExtensionMsg_PermissionSetStruct withheld_permissions;
 
   // We keep this separate so that it can be used in logging.
   std::string id;
 
   // Send creation flags so extension is initialized identically.
   int creation_flags;
 };
 
+struct ExtensionHostMsg_AutomationQuerySelector_Error {
+  enum Value { kNone, kNoMainFrame, kNoDocument, kNodeDestroyed };
+
+  ExtensionHostMsg_AutomationQuerySelector_Error() : value(kNone) {}
+
+  Value value;
+};
+
 namespace IPC {
 
 template <>
 struct ParamTraits<URLPattern> {
   typedef URLPattern param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, PickleIterator* iter, param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
 
@@ skipping 42 matching lines @@
   typedef ExtensionMsg_Loaded_Params param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, PickleIterator* iter, param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
 
 }  // namespace IPC
 
 #endif  // EXTENSIONS_COMMON_EXTENSION_MESSAGES_H_
 
+IPC_ENUM_TRAITS_MAX_VALUE(
+    ExtensionHostMsg_AutomationQuerySelector_Error::Value,
+    ExtensionHostMsg_AutomationQuerySelector_Error::kNodeDestroyed)
+
+IPC_STRUCT_TRAITS_BEGIN(ExtensionHostMsg_AutomationQuerySelector_Error)
+IPC_STRUCT_TRAITS_MEMBER(value)
+IPC_STRUCT_TRAITS_END()
+
 // Parameters structure for ExtensionMsg_UpdatePermissions.
 IPC_STRUCT_BEGIN(ExtensionMsg_UpdatePermissions_Params)
   IPC_STRUCT_MEMBER(std::string, extension_id)
   IPC_STRUCT_MEMBER(ExtensionMsg_PermissionSetStruct, active_permissions)
   IPC_STRUCT_MEMBER(ExtensionMsg_PermissionSetStruct, withheld_permissions)
 IPC_STRUCT_END()
 
 // Messages sent from the browser to the renderer.
 
 // The browser sends this message in response to all extension api calls. The
@@ skipping 410 matching lines @@
                      int /* element_instance_id */,
                      int /* guest_instance_id */,
                      base::DictionaryValue /* attach_params */)
 
 // Tells the browser to create a mime handler guest view for a plugin.
 IPC_MESSAGE_CONTROL4(ExtensionHostMsg_CreateMimeHandlerViewGuest,
                      int /* render_frame_id */,
                      std::string /* embedder_url */,
                      std::string /* mime_type */,
                      int /* element_instance_id */)
+
+// Sent when a query selector request is made from the automation API.
+// acc_obj_id is the accessibility tree ID of the starting element.
+IPC_MESSAGE_ROUTED3(ExtensionMsg_AutomationQuerySelector,
+                    int /* request_id */,
+                    int /* acc_obj_id */,
+                    base::string16 /* selector */)
+
+// Result of a query selector request.
+// result_acc_obj_id is the accessibility tree ID of the result element; 0
+// indicates no result.
+IPC_MESSAGE_ROUTED3(ExtensionHostMsg_AutomationQuerySelector_Result,
+                    int /* request_id */,
+                    ExtensionHostMsg_AutomationQuerySelector_Error /* error */,
+                    int /* result_acc_obj_id */)