Add host resolver rules experimental flag for Cronet

components/cronet/android/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/url_request_context_adapter.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <limits>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
+#include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "components/cronet/url_request_context_config.h"
 #include "net/android/network_change_notifier_factory_android.h"
 #include "net/base/net_errors.h"
 #include "net/base/network_change_notifier.h"
 #include "net/base/network_delegate_impl.h"
 #include "net/base/url_util.h"
 #include "net/cert/cert_verifier.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_network_layer.h"
 #include "net/http/http_server_properties.h"
 #include "net/log/write_to_file_net_log_observer.h"
 #include "net/proxy/proxy_service.h"
 #include "net/sdch/sdch_owner.h"
 #include "net/ssl/ssl_config_service_defaults.h"
 #include "net/url_request/static_http_user_agent_settings.h"
 #include "net/url_request/url_request_context_builder.h"
 #include "net/url_request/url_request_context_storage.h"
 #include "net/url_request/url_request_job_factory_impl.h"
 #include "url/scheme_host_port.h"
 
 namespace {
 
+// Use a global NetLog instance. See crbug.com/486120.
+static base::LazyInstance<net::NetLog>::Leaky g_net_log =
+    LAZY_INSTANCE_INITIALIZER;
+
 class BasicNetworkDelegate : public net::NetworkDelegateImpl {
  public:
   BasicNetworkDelegate() {}
   ~BasicNetworkDelegate() override {}
 
  private:
   // net::NetworkDelegate implementation.
   int OnBeforeURLRequest(net::URLRequest* request,
                          const net::CompletionCallback& callback,
                          GURL* new_url) override {
@@ skipping 90 matching lines @@
 
 void URLRequestContextAdapter::InitRequestContextOnNetworkThread() {
   DCHECK(GetNetworkTaskRunner()->BelongsToCurrentThread());
   DCHECK(config_);
   // TODO(mmenke):  Add method to have the builder enable SPDY.
   net::URLRequestContextBuilder context_builder;
 
   context_builder.set_network_delegate(
       base::WrapUnique(new BasicNetworkDelegate()));
   context_builder.set_proxy_config_service(std::move(proxy_config_service_));
-  config_->ConfigureURLRequestContextBuilder(&context_builder, nullptr,
-                                             nullptr);
+  config_->ConfigureURLRequestContextBuilder(&context_builder,
+                                             g_net_log.Pointer(), nullptr);
 
   context_ = context_builder.Build();
 
   if (config_->enable_sdch) {
     DCHECK(context_->sdch_manager());
     sdch_owner_.reset(
         new net::SdchOwner(context_->sdch_manager(), context_.get()));
   }
 
   if (config_->enable_quic) {
@@ skipping 144 matching lines @@
     write_to_file_observer_.reset();
   }
 }
 
 void NetLogObserver::OnAddEntry(const net::NetLog::Entry& entry) {
   VLOG(2) << "Net log entry: type=" << entry.type()
           << ", source=" << entry.source().type << ", phase=" << entry.phase();
 }
 
 }  // namespace cronet