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

components/cronet/ios/cronet_environment.mm

 // 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.
 
 #include "components/cronet/ios/cronet_environment.h"
 
 #include <utility>
 
 #include "base/at_exit.h"
 #include "base/atomicops.h"
@@ skipping 203 matching lines @@
                                     int port,
                                     int alternate_port) {
   DCHECK(port == alternate_port);
   quic_hints_.push_back(net::HostPortPair(host, port));
 }
 
 CronetEnvironment::CronetEnvironment(const std::string& user_agent,
                                      bool user_agent_partial)
     : http2_enabled_(false),
       quic_enabled_(false),
+      http_cache_(URLRequestContextConfig::HttpCacheType::DISK),
       user_agent_(user_agent),
       user_agent_partial_(user_agent_partial),
       net_log_(new net::NetLog) {}
 
 void CronetEnvironment::Start() {
   // Threads setup.
   network_cache_thread_.reset(new base::Thread("Chrome Network Cache Thread"));
   network_cache_thread_->StartWithOptions(
       base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
   network_io_thread_.reset(new base::Thread("Chrome Network IO Thread"));
@@ skipping 46 matching lines @@
 
   // Cache
   base::FilePath cache_path;
   if (!PathService::Get(base::DIR_CACHE, &cache_path))
     return;
   cache_path = cache_path.Append(FILE_PATH_LITERAL("cronet"));
 
   URLRequestContextConfigBuilder context_config_builder;
   context_config_builder.enable_quic = quic_enabled_;   // Enable QUIC.
   context_config_builder.enable_spdy = http2_enabled_;  // Enable HTTP/2.
-  context_config_builder.http_cache = URLRequestContextConfig::DISK;
+  context_config_builder.http_cache = http_cache_;      // Set HTTP cache
   context_config_builder.storage_path =
       cache_path.value();  // Storage path for http cache and cookie storage.
   context_config_builder.user_agent =
       user_agent_;  // User-Agent request header field.
   context_config_builder.mock_cert_verifier = std::move(
       mock_cert_verifier_);  // MockCertVerifier to use for testing purposes.
   std::unique_ptr<URLRequestContextConfig> config =
       context_config_builder.Build();
 
   net::URLRequestContextBuilder context_builder;
@@ skipping 69 matching lines @@
   event->Signal();
 }
 
 std::string CronetEnvironment::getDefaultQuicUserAgentId() const {
   return base::SysNSStringToUTF8([[NSBundle mainBundle]
              objectForInfoDictionaryKey:@"CFBundleDisplayName"]) +
          " Cronet/" + CRONET_VERSION;
 }
 
 }  // namespace cronet