[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 2295182767e60652f77da523e2a2023796c587f5..463f0b10d28f5a2f19c4073f24c205aee0e53da2 100644
--- a/chrome/test/chromedriver/command_executor_impl.cc
+++ b/chrome/test/chromedriver/command_executor_impl.cc
@@ -50,9 +50,13 @@ void CommandExecutorImpl::Init() {
   command_map_.Set("getTitle", base::Bind(execute_session_command,
       base::Bind(&ExecuteGetTitle)));
   command_map_.Set("findElement", base::Bind(execute_session_command,
-      base::Bind(&ExecuteFindElement)));
+      base::Bind(&ExecuteFindElement, 50)));
   command_map_.Set("findElements", base::Bind(execute_session_command,
-      base::Bind(&ExecuteFindElements)));
+      base::Bind(&ExecuteFindElements, 50)));
+  command_map_.Set("findChildElement", base::Bind(execute_session_command,
+      base::Bind(&ExecuteFindChildElement, 50)));
+  command_map_.Set("findChildElements", base::Bind(execute_session_command,
+      base::Bind(&ExecuteFindChildElements, 50)));
   command_map_.Set("setTimeout", base::Bind(execute_session_command,
       base::Bind(&ExecuteSetTimeout)));
   command_map_.Set("getCurrentUrl", base::Bind(execute_session_command,