Add net::HttpServer::Delegate::OnConnect() function and set ChromeDriver buffer sizes to 100 MB

cloud_print/gcp20/prototype/privet_http_server.h

Index: cloud_print/gcp20/prototype/privet_http_server.h
diff --git a/cloud_print/gcp20/prototype/privet_http_server.h b/cloud_print/gcp20/prototype/privet_http_server.h
index 6cb14d106459a1ec66d37cc0818fce74518fe056..5a3a2fe589a84cd6ceb448c30872e0a7007e13a3 100644
--- a/cloud_print/gcp20/prototype/privet_http_server.h
+++ b/cloud_print/gcp20/prototype/privet_http_server.h
@@ -141,6 +141,7 @@ class PrivetHttpServer: public net::HttpServer::Delegate {
 
  private:
   // net::HttpServer::Delegate methods:
+  virtual void OnConnect(int connection_id) OVERRIDE {}
   virtual void OnHttpRequest(
       int connection_id,
       const net::HttpServerRequestInfo& info) OVERRIDE;