Add functionality for embedders to configure NQE

components/cronet/url_request_context_config.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/url_request_context_config.h"
 
 #include <utility>
 
 #include "base/json/json_reader.h"
 #include "base/logging.h"
@@ skipping 61 matching lines @@
 const char kStaleDnsMaxStaleUses[] = "max_stale_uses";
 // Name of boolean to allow stale DNS results from other networks to be used on
 // the current network.
 const char kStaleDnsAllowOtherNetwork[] = "allow_other_network";
 
 // Rules to override DNS resolution. Intended for testing.
 // See explanation of format in net/dns/mapped_host_resolver.h.
 const char kHostResolverRulesFieldTrialName[] = "HostResolverRules";
 const char kHostResolverRules[] = "host_resolver_rules";
 
+// NetworkQualityEstimator experiment dictionary name.
+const char kNetworkQualityEstimatorFieldTrialName[] = "NetworkQualityEstimator";
+
 // Disable IPv6 when on WiFi. This is a workaround for a known issue on certain
 // Android phones, and should not be necessary when not on one of those devices.
 // See https://crbug.com/696569 for details.
 const char kDisableIPv6OnWifi[] = "disable_ipv6_on_wifi";
 
 const char kSSLKeyLogFile[] = "ssl_key_log_file";
 
 // Returns the effective experimental options.
 std::unique_ptr<base::DictionaryValue> ParseAndSetExperimentalOptions(
     const std::string& experimental_options,
@@ skipping 176 matching lines @@
         if (!ssl_key_log_file.empty() && file_task_runner) {
           // SetSSLKeyLogFile is only safe to call before any SSLClientSockets
           // are created. This should not be used if there are multiple
           // CronetEngine.
           // TODO(xunjieli): Expose this as a stable API after crbug.com/458365
           // is resolved.
           net::SSLClientSocket::SetSSLKeyLogFile(ssl_key_log_file,
                                                  file_task_runner);
         }
       }
+    } else if (it.key() == kNetworkQualityEstimatorFieldTrialName) {
+      const base::DictionaryValue* nqe_args = nullptr;
+      if (!it.value().GetAsDictionary(&nqe_args)) {
+        LOG(ERROR) << "\"" << it.key() << "\" config params \"" << it.value()
+                   << "\" is not a dictionary value";
+        effective_experimental_options->Remove(it.key(), nullptr);
+      }
     } else {
       LOG(WARNING) << "Unrecognized Cronet experimental option \"" << it.key()
                    << "\" with params \"" << it.value();
       effective_experimental_options->Remove(it.key(), nullptr);
     }
   }
 
   if (async_dns_enable || stale_dns_enable || host_resolver_rules_enable ||
       disable_ipv6_on_wifi) {
     CHECK(net_log) << "All DNS-related experiments require NetLog.";
@@ skipping 58 matching lines @@
     : enable_quic(enable_quic),
       quic_user_agent_id(quic_user_agent_id),
       enable_spdy(enable_spdy),
       enable_sdch(enable_sdch),
       enable_brotli(enable_brotli),
       http_cache(http_cache),
       http_cache_max_size(http_cache_max_size),
       load_disable_cache(load_disable_cache),
       storage_path(storage_path),
       user_agent(user_agent),
-      experimental_options(experimental_options),
       mock_cert_verifier(std::move(mock_cert_verifier)),
       enable_network_quality_estimator(enable_network_quality_estimator),
       bypass_public_key_pinning_for_local_trust_anchors(
           bypass_public_key_pinning_for_local_trust_anchors),
-      cert_verifier_data(cert_verifier_data) {}
+      cert_verifier_data(cert_verifier_data),
+      experimental_options(experimental_options) {}
 
 URLRequestContextConfig::~URLRequestContextConfig() {}
 
 void URLRequestContextConfig::ConfigureURLRequestContextBuilder(
     net::URLRequestContextBuilder* context_builder,
     net::NetLog* net_log,
     const scoped_refptr<base::SequencedTaskRunner>& file_task_runner) {
   DCHECK(net_log);
 
   std::string config_cache;
@@ skipping 43 matching lines @@
 URLRequestContextConfigBuilder::Build() {
   return base::MakeUnique<URLRequestContextConfig>(
       enable_quic, quic_user_agent_id, enable_spdy, enable_sdch, enable_brotli,
       http_cache, http_cache_max_size, load_disable_cache, storage_path,
       user_agent, experimental_options, std::move(mock_cert_verifier),
       enable_network_quality_estimator,
       bypass_public_key_pinning_for_local_trust_anchors, cert_verifier_data);
 }
 
 }  // namespace cronet