Add new system url request context getter to the blimp engine.

blimp/engine/app/blimp_url_request_context_getter.h

 // Copyright 2015 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 BLIMP_ENGINE_APP_BLIMP_URL_REQUEST_CONTEXT_GETTER_H_
 #define BLIMP_ENGINE_APP_BLIMP_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include <memory>
 
 #include "base/files/file_path.h"
@@ skipping 11 matching lines @@
 class HostResolver;
 class NetworkDelegate;
 class NetLog;
 class ProxyConfigService;
 class ProxyService;
 }
 
 namespace blimp {
 namespace engine {
 
+// The URLRequestContextGetter for Blimp "user" requests.
+// System request context is handled in a separate class.
 class BlimpURLRequestContextGetter : public net::URLRequestContextGetter {
  public:
   // The content of |protocol_handlers| is is swapped into the new instance.
   BlimpURLRequestContextGetter(
       bool ignore_certificate_errors,
       const base::FilePath& base_path,
       const scoped_refptr<base::SingleThreadTaskRunner>& io_loop_task_runner,
       const scoped_refptr<base::SingleThreadTaskRunner>& file_loop_task_runner,
       content::ProtocolHandlerMap* protocol_handlers,
       content::URLRequestInterceptorScopedVector request_interceptors,
@@ skipping 20 matching lines @@
   content::ProtocolHandlerMap protocol_handlers_;
   content::URLRequestInterceptorScopedVector request_interceptors_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpURLRequestContextGetter);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_APP_BLIMP_URL_REQUEST_CONTEXT_GETTER_H_