Moving gRPC support interfaces out of cronet and into a new component.

components/cronet/ios/cronet_environment.h

 // Copyright 2016 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_IOS_CRONET_ENVIRONMENT_H_
 #define COMPONENTS_CRONET_IOS_CRONET_ENVIRONMENT_H_
 
 #include <list>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "components/cronet/url_request_context_config.h"
+#include "components/grpc_support/environment.h"
 #include "net/cert/cert_verifier.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 
 class JsonPrefStore;
 
 namespace base {
 class WaitableEvent;
 }  // namespace base
 
 namespace net {
 class HttpCache;
 class NetworkChangeNotifier;
 class NetLog;
 class ProxyConfigService;
 class WriteToFileNetLogObserver;
 }  // namespace net
 
 namespace cronet {
 // CronetEnvironment contains all the network stack configuration
 // and initialization.
-class CronetEnvironment {
+class CronetEnvironment : public grpc_support::Environment {
  public:
   // Initialize Cronet environment globals. Must be called only once on the
   // main thread.
   static void Initialize();
 
   // |user_agent_product_name| will be used to generate the user-agent.
   CronetEnvironment(const std::string& user_agent_product_name);
   ~CronetEnvironment();
 
   // Starts this instance of Cronet environment.
   void Start();
 
-  // The full user-agent.
-  std::string user_agent();
-
   // Creates a new net log (overwrites existing file with this name). If
   // actively logging, this call is ignored.
   void StartNetLog(base::FilePath::StringType file_name, bool log_bytes);
   // Stops logging and flushes file. If not currently logging this call is
   // ignored.
   void StopNetLog();
 
   void AddQuicHint(const std::string& host, int port, int alternate_port);
 
   // Setters and getters for |http2_enabled_|, |quic_enabled_|, and
@@ skipping 10 matching lines @@
   }
 
   void set_host_resolver_rules(const std::string& host_resolver_rules) {
     host_resolver_rules_ = host_resolver_rules;
   }
 
   void set_ssl_key_log_file_name(const std::string& ssl_key_log_file_name) {
     ssl_key_log_file_name_ = ssl_key_log_file_name;
   }
 
-  net::URLRequestContext* GetURLRequestContext() const;
-
-  bool IsOnNetworkThread();
-
-  // Runs a closure on the network thread.
+  // grpc_support::Environment implementation.
+  bool IsOnNetworkThread() override;
   void PostToNetworkThread(const tracked_objects::Location& from_here,
-                           const base::Closure& task);
+                           const base::Closure& task) override;
+  net::URLRequestContext* GetURLRequestContext() const override;
+  std::string UserAgent() override;
 
  private:
   // Performs initialization tasks that must happen on the network thread.
   void InitializeOnNetworkThread();
 
   // Runs a closure on the file user blocking thread.
   void PostToFileUserBlockingThread(const tracked_objects::Location& from_here,
                                     const base::Closure& task);
 
   // Helper methods that start/stop net logging on the network thread.
@@ skipping 26 matching lines @@
   std::string user_agent_product_name_;
   std::unique_ptr<net::NetLog> net_log_;
   std::unique_ptr<net::WriteToFileNetLogObserver> net_log_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(CronetEnvironment);
 };
 
 }  // namespace cronet
 
 #endif  // COMPONENTS_CRONET_IOS_CRONET_ENVIRONMENT_H_