[chromedriver]Implement command: title.

chrome/test/chromedriver/commands.cc

Index: chrome/test/chromedriver/commands.cc
diff --git a/chrome/test/chromedriver/commands.cc b/chrome/test/chromedriver/commands.cc
index f90388ab0648645c74f94b91098fb5b473964eda..38a77113e9ef0434ae09b89598716c830bbd8546 100644
--- a/chrome/test/chromedriver/commands.cc
+++ b/chrome/test/chromedriver/commands.cc
@@ -105,3 +105,19 @@ Status ExecuteExecuteScript(
   return session->chrome->CallFunction(
       "function(){" + script + "}", *args, value);
 }
+
+Status ExecuteGetTitle(
+    Session* session,
+    const base::DictionaryValue& params,
+    scoped_ptr<base::Value>* value) {
+  const char* kGetTitleScript =
+      "function() {"
+      "  if (document.title)"
+      "    return document.title;"
+      "  else"
+      "    return document.URL;"
+      "}";
+  base::ListValue args;
+  return session->chrome->CallFunction(
+      kGetTitleScript, args, value);
+}