[chromedriver] Implement commands: findChildElement, findChildElements.

chrome/test/chromedriver/command_executor_impl.cc

Index: chrome/test/chromedriver/command_executor_impl.cc
diff --git a/chrome/test/chromedriver/command_executor_impl.cc b/chrome/test/chromedriver/command_executor_impl.cc
index eac1708cdd9097e13e73a40880e0420fc2aaac79..c14b8cf108340c85473e6b5c585f7779fa1ee03d 100644
--- a/chrome/test/chromedriver/command_executor_impl.cc
+++ b/chrome/test/chromedriver/command_executor_impl.cc
@@ -53,6 +53,10 @@ void CommandExecutorImpl::Init() {
       base::Bind(&ExecuteFindElement)));
   command_map_.Set("findElements", base::Bind(execute_session_command,
       base::Bind(&ExecuteFindElements)));
+  command_map_.Set("findChildElement", base::Bind(execute_session_command,
+      base::Bind(&ExecuteFindChildElement)));
+  command_map_.Set("findChildElements", base::Bind(execute_session_command,
+      base::Bind(&ExecuteFindChildElements)));
   command_map_.Set("setTimeout", base::Bind(execute_session_command,
       base::Bind(&ExecuteSetTimeout)));
   Command quit_command = base::Bind(execute_session_command,