[chromedriver] Improve timeout behavior. Prompted by user who executes script on busy page.

chrome/test/chromedriver/chrome/devtools_client_impl.h

Index: chrome/test/chromedriver/chrome/devtools_client_impl.h
diff --git a/chrome/test/chromedriver/chrome/devtools_client_impl.h b/chrome/test/chromedriver/chrome/devtools_client_impl.h
index 4dad6a56bfcc73cff40f8bd6fdb87519f40d960b..1fe1f0a870f0761436841cb9d7a0303d0e7901bf 100644
--- a/chrome/test/chromedriver/chrome/devtools_client_impl.h
+++ b/chrome/test/chromedriver/chrome/devtools_client_impl.h
@@ -118,7 +118,7 @@ class DevToolsClientImpl : public DevToolsClient {
       const std::string& method,
       const base::DictionaryValue& params,
       scoped_ptr<base::DictionaryValue>* result);
-  Status ProcessNextMessage(int expected_id);
+  Status ProcessNextMessage(int expected_id, const base::TimeDelta& timeout);
   Status ProcessEvent(const internal::InspectorEvent& event);
   Status ProcessCommandResponse(
       const internal::InspectorCommandResponse& response);