Implement offline mode behind a flag

content/browser/loader/global_routing_id.h

+// 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.
+
+#ifndef CONTENT_PUBLIC_BROWSER_GLOBAL_ROUTING_ID_H_
+#define CONTENT_PUBLIC_BROWSER_GLOBAL_ROUTING_ID_H_
+
+namespace content {
+
+// Uniquely identifies the route from which a net::URLRequest comes.
+struct GlobalRoutingID {
+  GlobalRoutingID() : child_id(-1), route_id(-1) {
+  }
+
+  GlobalRoutingID(int child_id, int route_id)
+      : child_id(child_id),
+        route_id(route_id) {
+  }
+
+  // The unique ID of the child process (different from OS's PID).
+  int child_id;
+
+  // The route ID (unique for each URLRequest source).
+  int route_id;
+
+  bool operator<(const GlobalRoutingID& other) const {
+    if (child_id == other.child_id)
+      return route_id < other.route_id;
+    return child_id < other.child_id;
+  }
+  bool operator==(const GlobalRoutingID& other) const {
+    return child_id == other.child_id &&
+        route_id == other.route_id;
+  }
+  bool operator!=(const GlobalRoutingID& other) const {
+    return !(*this == other);
+  }
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_GLOBAL_ROUTING_ID_H_