Add functionality for embedders to configure NQE

components/cronet/url_request_context_config.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_URL_REQUEST_CONTEXT_CONFIG_H_
 #define COMPONENTS_CRONET_URL_REQUEST_CONTEXT_CONFIG_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/optional.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "net/base/hash_value.h"
 #include "net/cert/cert_verifier.h"
+#include "net/nqe/effective_connection_type.h"
 
 namespace base {
 class SequencedTaskRunner;
 }  // namespace base
 
 namespace net {
 class CertVerifier;
 class NetLog;
 class URLRequestContextBuilder;
 }  // namespace net
@@ skipping 106 matching lines @@
   const HttpCacheType http_cache;
   // Max size of http cache in bytes.
   const int http_cache_max_size;
   // Disable caching for HTTP responses. Other information may be stored in
   // the cache.
   const bool load_disable_cache;
   // Storage path for http cache and cookie storage.
   const std::string storage_path;
   // User-Agent request header field.
   const std::string user_agent;
-  // Experimental options encoded as a string in a JSON format containing
-  // experiments and their corresponding configuration options. The format
-  // is a JSON object with the name of the experiment as the key, and the
-  // configuration options as the value. An example:
-  //   {"experiment1": {"option1": "option_value1", "option2": "option_value2",
-  //    ...}, "experiment2: {"option3", "option_value3", ...}, ...}
-  const std::string experimental_options;
 
   // Certificate verifier for testing.
   std::unique_ptr<net::CertVerifier> mock_cert_verifier;
 
-  // Enable network quality estimator.
+  // Enable Network Quality Estimator (NQE).
   const bool enable_network_quality_estimator;
 
   // Enable public key pinning bypass for local trust anchors.
   const bool bypass_public_key_pinning_for_local_trust_anchors;
 
   // Data to populte CertVerifierCache.
   const std::string cert_verifier_data;
 
   // App-provided list of servers that support QUIC.
   std::vector<std::unique_ptr<QuicHint>> quic_hints;
 
   // The list of public key pins.
   std::vector<std::unique_ptr<Pkp>> pkp_list;
 
   // Enable DNS cache persistence.
   bool enable_host_cache_persistence = false;
 
   // Minimum time in milliseconds between writing the HostCache contents to
   // prefs. Only relevant when |enable_host_cache_persistence| is true.
   int host_cache_persistence_delay_ms = 60000;
 
   // Experimental options that are recognized by the config parser.
   std::unique_ptr<base::DictionaryValue> effective_experimental_options =
       nullptr;
 
+  // Enable reading of the network quality from the prefs.
+  bool nqe_persistent_caching_enabled;
+
+  // If set, forces NQE to return the set value as the effective connection
+  // type.
+  base::Optional<net::EffectiveConnectionType>
+      nqe_forced_effective_connection_type;
+
  private:
   // Parses experimental options and makes appropriate changes to settings in
   // the URLRequestContextConfig and URLRequestContextBuilder.
   void ParseAndSetExperimentalOptions(
       net::URLRequestContextBuilder* context_builder,
       net::NetLog* net_log,
       const scoped_refptr<base::SequencedTaskRunner>& file_task_runner);
 
+  // Experimental options encoded as a string in a JSON format containing
+  // experiments and their corresponding configuration options. The format
+  // is a JSON object with the name of the experiment as the key, and the
+  // configuration options as the value. An example:
+  //   {"experiment1": {"option1": "option_value1", "option2": "option_value2",
+  //    ...}, "experiment2: {"option3", "option_value3", ...}, ...}
+  const std::string experimental_options;
+
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextConfig);
 };
 
 // Stores intermediate state for URLRequestContextConfig.  Initializes with
 // (mostly) sane defaults, then the appropriate member variables can be
 // modified, and it can be finalized with Build().
 struct URLRequestContextConfigBuilder {
   URLRequestContextConfigBuilder();
   ~URLRequestContextConfigBuilder();
 
@@ skipping 44 matching lines @@
   // Data to populate CertVerifierCache.
   std::string cert_verifier_data = "";
 
  private:
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextConfigBuilder);
 };
 
 }  // namespace cronet
 
 #endif  // COMPONENTS_CRONET_URL_REQUEST_CONTEXT_CONFIG_H_