[Cronet] Leak NetLog instance used by CronetUrlRequestContextAdapter

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 <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <map>
 #include <utility>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "components/cronet/histogram_manager.h"
 #include "components/cronet/url_request_context_config.h"
@@ skipping 20 matching lines @@
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_builder.h"
 #include "net/url_request/url_request_interceptor.h"
 
 #if defined(DATA_REDUCTION_PROXY_SUPPORT)
 #include "components/cronet/android/cronet_data_reduction_proxy.h"
 #endif
 
 namespace {
 
+// Use a global NetLog instance. See crbug.com/486120.
+static base::LazyInstance<net::NetLog>::Leaky g_net_log =
+    LAZY_INSTANCE_INITIALIZER;
+
 const char kHttpServerProperties[] = "net.http_server_properties";
 // Current version of disk storage.
 const int32_t kStorageVersion = 1;
 // Version number used when the version of disk storage is unknown.
 const uint32_t kStorageVersionUnknown = 0;
 // Name of preference directory.
 const char kPrefsDirectoryName[] = "prefs";
 // Name of preference file.
 const char kPrefsFileName[] = "local_prefs.json";
 
@@ skipping 403 matching lines @@
   // TODO(mmenke):  Add method to have the builder enable SPDY.
   net::URLRequestContextBuilder context_builder;
 
   // TODO(mef): Remove this work around for crbug.com/543366 once it is fixed.
   net::URLRequestContextBuilder::HttpNetworkSessionParams
       custom_http_network_session_params;
   custom_http_network_session_params.parse_alternative_services = false;
   context_builder.set_http_network_session_params(
       custom_http_network_session_params);
 
-  net_log_.reset(new net::NetLog);
   scoped_ptr<net::NetworkDelegate> network_delegate(new BasicNetworkDelegate());
 #if defined(DATA_REDUCTION_PROXY_SUPPORT)
   DCHECK(!data_reduction_proxy_);
   // For now, the choice to enable the data reduction proxy happens once,
   // at initialization. It cannot be disabled thereafter.
   if (!config->data_reduction_proxy_key.empty()) {
     data_reduction_proxy_.reset(new CronetDataReductionProxy(
         config->data_reduction_proxy_key, config->data_reduction_primary_proxy,
         config->data_reduction_fallback_proxy,
         config->data_reduction_secure_proxy_check_url, config->user_agent,
-        GetNetworkTaskRunner(), net_log_.get()));
+        GetNetworkTaskRunner(), g_net_log.Pointer()));
     network_delegate = data_reduction_proxy_->CreateNetworkDelegate(
         std::move(network_delegate));
     context_builder.set_proxy_delegate(
         data_reduction_proxy_->CreateProxyDelegate());
     std::vector<scoped_ptr<net::URLRequestInterceptor>> interceptors;
     interceptors.push_back(data_reduction_proxy_->CreateInterceptor());
     context_builder.SetInterceptors(std::move(interceptors));
   }
 #endif  // defined(DATA_REDUCTION_PROXY_SUPPORT)
   context_builder.set_network_delegate(std::move(network_delegate));
-  context_builder.set_net_log(net_log_.get());
+  context_builder.set_net_log(g_net_log.Pointer());
 
   // Android provides a local HTTP proxy server that handles proxying when a PAC
   // URL is present. Create a proxy service without a resolver and rely on this
   // local HTTP proxy. See: crbug.com/432539.
   context_builder.set_proxy_service(
       net::ProxyService::CreateWithoutProxyResolver(
-          std::move(proxy_config_service_), net_log_.get()));
+          std::move(proxy_config_service_), g_net_log.Pointer()));
 
-  config->ConfigureURLRequestContextBuilder(&context_builder, net_log_.get(),
-                                            GetFileThread()->task_runner());
+  config->ConfigureURLRequestContextBuilder(
+      &context_builder, g_net_log.Pointer(), GetFileThread()->task_runner());
 
   // Set up pref file if storage path is specified.
   if (!config->storage_path.empty()) {
     base::FilePath storage_path(config->storage_path);
     // Make sure storage directory has correct version.
     InitializeStorageDirectory(storage_path);
     base::FilePath filepath =
         storage_path.Append(FILE_PATH_LITERAL(kPrefsDirectoryName))
             .Append(FILE_PATH_LITERAL(kPrefsFileName));
     json_pref_store_ = new JsonPrefStore(
@@ skipping 355 matching lines @@
     JNIEnv* env,
     const JavaParamRef<jclass>& jcaller) {
   base::StatisticsRecorder::Initialize();
   std::vector<uint8_t> data;
   if (!HistogramManager::GetInstance()->GetDeltas(&data))
     return ScopedJavaLocalRef<jbyteArray>();
   return base::android::ToJavaByteArray(env, &data[0], data.size());
 }
 
 }  // namespace cronet