[Cronet] Enable persistence mode for Sdch

components/cronet/android/cronet_url_request_context_adapter.cc

 // 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.
 
 #include "components/cronet/android/cronet_url_request_context_adapter.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
 #include "base/logging.h"
 #include "base/memory/scoped_vector.h"
+#include "base/prefs/pref_filter.h"
 #include "base/single_thread_task_runner.h"
 #include "base/values.h"
 #include "components/cronet/url_request_context_config.h"
 #include "jni/CronetUrlRequestContext_jni.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/base/network_delegate_impl.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/log/write_to_file_net_log_observer.h"
 #include "net/proxy/proxy_service.h"
@@ skipping 154 matching lines @@
         data_reduction_proxy_->CreateNetworkDelegate(network_delegate.Pass());
     ScopedVector<net::URLRequestInterceptor> interceptors;
     interceptors.push_back(data_reduction_proxy_->CreateInterceptor());
     context_builder.SetInterceptors(interceptors.Pass());
   }
 #endif  // defined(DATA_REDUCTION_PROXY_SUPPORT)
   context_builder.set_network_delegate(network_delegate.release());
   context_builder.set_net_log(net_log.release());
   context_builder.set_proxy_config_service(proxy_config_service_.release());
   config->ConfigureURLRequestContextBuilder(&context_builder);
+
+  // Set up pref file if storage path is specified.
+  // TODO(xunjieli): maybe get rid of the condition on sdch.
+  if (!config->storage_path.empty() && config->enable_sdch) {
+    base::FilePath filepath(config->storage_path);
+    filepath = filepath.Append(FILE_PATH_LITERAL("local_prefs.json"));
+    json_pref_store_ = new JsonPrefStore(
+        filepath, GetFileThread()->task_runner(), scoped_ptr<PrefFilter>());
+    json_pref_store_->ReadPrefsAsync(nullptr);
+    context_builder.SetFileTaskRunner(GetFileThread()->task_runner());
+  }
+
   context_.reset(context_builder.Build());
 
   default_load_flags_ = net::LOAD_DO_NOT_SAVE_COOKIES |
                         net::LOAD_DO_NOT_SEND_COOKIES;
   if (config->load_disable_cache)
     default_load_flags_ |= net::LOAD_DISABLE_CACHE;
 
   if (config->enable_sdch) {
     DCHECK(context_->sdch_manager());
     sdch_owner_.reset(
         new net::SdchOwner(context_->sdch_manager(), context_.get()));
+    if (json_pref_store_)
+      sdch_owner_->EnablePersistentStorage(json_pref_store_.get());
   }
 
   // Currently (circa M39) enabling QUIC requires setting probability threshold.
   if (config->enable_quic) {
     context_->http_server_properties()
         ->SetAlternativeServiceProbabilityThreshold(0.0f);
     for (auto hint = config->quic_hints.begin();
          hint != config->quic_hints.end(); ++hint) {
       const URLRequestContextConfig::QuicHint& quic_hint = **hint;
       if (quic_hint.host.empty()) {
@@ skipping 136 matching lines @@
 }
 
 void CronetURLRequestContextAdapter::StopNetLogOnNetworkThread() {
   DCHECK(GetNetworkTaskRunner()->BelongsToCurrentThread());
   if (write_to_file_observer_) {
     write_to_file_observer_->StopObserving(context_.get());
     write_to_file_observer_.reset();
   }
 }
 
+base::Thread* CronetURLRequestContextAdapter::GetFileThread() {

[mef, 2015/05/28 15:18:54]

add DCHECK(GetNetworkTaskRunner()->BelongsToCurrentThread());

[xunjieli, 2015/05/28 15:25:55]

Done.

+  if (!file_thread_) {
+    file_thread_.reset(new base::Thread("Network File Thread"));
+    file_thread_->Start();
+  }
+  return file_thread_.get();
+}
+
 // Creates RequestContextAdater if config is valid URLRequestContextConfig,
 // returns 0 otherwise.
 static jlong CreateRequestContextAdapter(JNIEnv* env,
                                          jclass jcaller,
                                          jstring jconfig) {
   std::string config_string =
       base::android::ConvertJavaStringToUTF8(env, jconfig);
   scoped_ptr<URLRequestContextConfig> context_config(
       new URLRequestContextConfig());
   if (!context_config->LoadFromJSON(config_string))
     return 0;
 
   CronetURLRequestContextAdapter* context_adapter =
       new CronetURLRequestContextAdapter(context_config.Pass());
   return reinterpret_cast<jlong>(context_adapter);
 }
 
 static jint SetMinLogLevel(JNIEnv* env, jclass jcaller, jint jlog_level) {
   jint old_log_level = static_cast<jint>(logging::GetMinLogLevel());
   // MinLogLevel is global, shared by all URLRequestContexts.
   logging::SetMinLogLevel(static_cast<int>(jlog_level));
   return old_log_level;
 }
 
 }  // namespace cronet