[chromedriver] Implement commands: findChildElement, findChildElements.

chrome/test/chromedriver/commands.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_TEST_CHROMEDRIVER_COMMANDS_H_
 #define CHROME_TEST_CHROMEDRIVER_COMMANDS_H_
 
 #include <map>
 #include <string>
 
@@ skipping 64 matching lines @@
     Session* session,
     const base::DictionaryValue& params,
     scoped_ptr<base::Value>* value);
 
 // Search for multiple elements on the page, starting from the document root.
 Status ExecuteFindElements(
     Session* session,
     const base::DictionaryValue& params,
     scoped_ptr<base::Value>* value);
 
+// Search for an element on the page, starting from the given element.
+Status ExecuteFindChildElement(
+    Session* session,
+    const base::DictionaryValue& params,
+    scoped_ptr<base::Value>* value);
+
+// Search for multiple elements on the page, starting from the given element.
+Status ExecuteFindChildElements(
+    Session* session,
+    const base::DictionaryValue& params,
+    scoped_ptr<base::Value>* value);
+
 // Configure the amount of time that a particular type of operation can execute
 // for before they are aborted and a timeout error is returned to the client.
 Status ExecuteSetTimeout(
     Session* session,
     const base::DictionaryValue& params,
     scoped_ptr<base::Value>* value);
 
 #endif  // CHROME_TEST_CHROMEDRIVER_COMMANDS_H_