Change multi-prerender API to include per launcher slots.

chrome/browser/prerender/prerender_config.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/prerender/prerender_config.h"
 
 namespace prerender {
 
 Config::Config() : max_bytes(100 * 1024 * 1024),
-                   max_concurrency(1),
+                   max_link_concurrency(1),
+                   max_link_concurrency_per_launcher(1),
                    rate_limit_enabled(true),
+                   max_wait_to_launch(base::TimeDelta::FromMinutes(4)),
                    time_to_live(base::TimeDelta::FromMinutes(5)),
                    abandon_time_to_live(base::TimeDelta::FromSeconds(30)),
                    https_allowed(true),
                    default_tab_bounds(640, 480),
                    is_overriding_user_agent(false) {
 }
 
 Config::~Config() { }
 
 }  // namespace prerender