Add some tests for ThrottlingResourceHandler.

content/browser/loader/throttling_resource_handler.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_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <vector>
 
+#include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/loader/layered_resource_handler.h"
+#include "content/common/content_export.h"
 #include "content/public/browser/resource_throttle.h"
 #include "net/url_request/redirect_info.h"
 #include "url/gurl.h"
 
 namespace net {
 class URLRequest;
 }
 
 namespace content {
 
 struct ResourceResponse;
 
 // Used to apply a list of ResourceThrottle instances to an URLRequest.
-class ThrottlingResourceHandler : public LayeredResourceHandler,
-                                  public ResourceThrottle::Delegate {
+class CONTENT_EXPORT ThrottlingResourceHandler
+    : public LayeredResourceHandler,
+      public ResourceThrottle::Delegate {
  public:
   ThrottlingResourceHandler(
       std::unique_ptr<ResourceHandler> next_handler,
       net::URLRequest* request,
       std::vector<std::unique_ptr<ResourceThrottle>> throttles);
   ~ThrottlingResourceHandler() override;
 
   // LayeredResourceHandler overrides:
   bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
                            ResourceResponse* response,
@@ skipping 25 matching lines @@
   DeferredStage deferred_stage_;
 
   std::vector<std::unique_ptr<ResourceThrottle>> throttles_;
   size_t next_index_;
 
   GURL deferred_url_;
   net::RedirectInfo deferred_redirect_;
   scoped_refptr<ResourceResponse> deferred_response_;
 
   bool cancelled_by_resource_throttle_;
+
+  DISALLOW_COPY_AND_ASSIGN(ThrottlingResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_