[chromedriver] Implement command: executeAsyncScript and setScriptTimeout

chrome/test/chromedriver/session_commands.h

Index: chrome/test/chromedriver/session_commands.h
diff --git a/chrome/test/chromedriver/session_commands.h b/chrome/test/chromedriver/session_commands.h
index 131ce7fe7ef310e7ba8d4e6e3c54169af49a3143..9a48a56914f8cfd77a1cf378be4f4bd88040aa5b 100644
--- a/chrome/test/chromedriver/session_commands.h
+++ b/chrome/test/chromedriver/session_commands.h
@@ -74,6 +74,12 @@ Status ExecuteSetTimeout(
     const base::DictionaryValue& params,
     scoped_ptr<base::Value>* value);
 
+// Set the timeout for asynchronous scripts.
+Status ExecuteSetScriptTimeout(
+    Session* session,
+    const base::DictionaryValue& params,
+    scoped_ptr<base::Value>* value);
+
 // Returns whether an alert is open.
 Status ExecuteGetAlert(
     Session* session,