[Cronet] Enable persistence mode for Sdch

components/cronet/android/url_request_context_adapter.h

 // Copyright 2014 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 COMPONENTS_CRONET_ANDROID_URL_REQUEST_CONTEXT_ADAPTER_H_
 #define COMPONENTS_CRONET_ANDROID_URL_REQUEST_CONTEXT_ADAPTER_H_
 
 #include <queue>
 #include <string>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/prefs/json_pref_store.h"
 #include "base/threading/thread.h"
 #include "net/log/net_log.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace net {
 class WriteToFileNetLogObserver;
 class ProxyConfigService;
 class SdchOwner;
 }  // namespace net
@@ skipping 65 matching lines @@
   // Initializes |context_| on the Network thread.
   void InitRequestContextOnNetworkThread();
 
   // Helper function to start writing NetLog data to file. This should only be
   // run after context is initialized.
   void StartNetLogToFileHelper(const std::string& file_name, bool log_all);
   // Helper function to stop writing NetLog data to file. This should only be
   // run after context is initialized.
   void StopNetLogHelper();
 
+  base::Thread* network_thread_;
+  scoped_ptr<base::Thread> file_thread_;
+
   scoped_refptr<URLRequestContextAdapterDelegate> delegate_;
   scoped_ptr<net::URLRequestContext> context_;
   std::string user_agent_;
   bool load_disable_cache_;
-  base::Thread* network_thread_;
   scoped_ptr<NetLogObserver> net_log_observer_;
   scoped_ptr<net::WriteToFileNetLogObserver> write_to_file_observer_;
   scoped_ptr<net::ProxyConfigService> proxy_config_service_;
+  // |sdch_owner_| should be destroyed before |json_pref_store_|, because
+  // tearing down |sdch_owner_| forces |json_pref_store_| to flush pending
+  // writes to the disk.
+  scoped_refptr<JsonPrefStore> json_pref_store_;
   scoped_ptr<net::SdchOwner> sdch_owner_;
   scoped_ptr<URLRequestContextConfig> config_;
 
   // A queue of tasks that need to be run after context has been initialized.
   std::queue<RunAfterContextInitTask> tasks_waiting_for_context_;
   bool is_context_initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextAdapter);
 };
 
 }  // namespace cronet
 
 #endif  // COMPONENTS_CRONET_ANDROID_URL_REQUEST_CONTEXT_ADAPTER_H_