Add configuration functions for HTTP cache type to Obj-C and C++

components/cronet/ios/cronet_environment.h

Index: components/cronet/ios/cronet_environment.h
diff --git a/components/cronet/ios/cronet_environment.h b/components/cronet/ios/cronet_environment.h
index fbcb74d84def55e3d1dc5e4c521ab330ebf8f332..59cb79627eaae374f1637f011f475303f506227b 100644
--- a/components/cronet/ios/cronet_environment.h
+++ b/components/cronet/ios/cronet_environment.h
@@ -87,6 +87,10 @@ class CronetEnvironment {
     mock_cert_verifier_ = std::move(mock_cert_verifier);
   }
 
+  void set_http_cache(URLRequestContextConfig::HttpCacheType http_cache) {
+    http_cache_ = http_cache;
+  }
+
   void SetHostResolverRules(const std::string& host_resolver_rules);
 
   void set_ssl_key_log_file_name(const std::string& ssl_key_log_file_name) {
@@ -131,6 +135,7 @@ class CronetEnvironment {
   std::string quic_user_agent_id_;
   std::string accept_language_;
   std::string ssl_key_log_file_name_;
+  URLRequestContextConfig::HttpCacheType http_cache_;
 
   std::list<net::HostPortPair> quic_hints_;