Add host resolver rules experimental flag for Cronet

components/cronet/url_request_context_config_unittest.cc

Index: components/cronet/url_request_context_config_unittest.cc
diff --git a/components/cronet/url_request_context_config_unittest.cc b/components/cronet/url_request_context_config_unittest.cc
index 8989d0188267ab4fb043a195c3242ac2b8975508..ac3295eaedb250aa76849f4c27f2c5513a6a871f 100644
--- a/components/cronet/url_request_context_config_unittest.cc
+++ b/components/cronet/url_request_context_config_unittest.cc
@@ -100,6 +100,54 @@ TEST(URLRequestContextConfigTest, SetQuicExperimentalOptions) {
   EXPECT_TRUE(context->host_resolver()->GetDnsConfigAsValue());
 }
 
+TEST(URLRequestContextConfigTest, SetDNSExperimentalOptions) {

[pauljensen, 2016/04/07 16:29:15]

how about we just merge this into SetQuicExperimentalOptions by adding the JSON
config and EXPECT_TRUE from this function to that one?  we should also rename
SetQuicExperimentalOptions to something more general (it's already testing
things other than QUIC stuff), perhaps TestExperimentalOptionPassing

[mgersh, 2016/06/08 18:31:14]

Done.

+  URLRequestContextConfig config(
+      // Enable QUIC.
+      true,
+      // QUIC User Agent ID.
+      "Default QUIC User Agent ID",
+      // Enable SPDY.
+      true,
+      // Enable SDCH.
+      false,
+      // Type of http cache.
+      URLRequestContextConfig::HttpCacheType::DISK,
+      // Max size of http cache in bytes.
+      1024000,
+      // Disable caching for HTTP responses. Other information may be stored in
+      // the cache.
+      false,
+      // Storage path for http cache and cookie storage.
+      "/data/data/org.chromium.net/app_cronet_test/test_storage",
+      // User-Agent request header field.
+      "fake agent",
+      // JSON encoded experimental options.
+      "{\"AsyncDNS\":{\"enable\":true},"
+      "\"HostResolverRules\":{\"host_resolver_rules\":"
+      "\"MAP * 127.0.0.1\"}}",
+      // Data reduction proxy key.
+      "",
+      // Data reduction proxy.
+      "",
+      // Fallback data reduction proxy.
+      "",
+      // Data reduction proxy secure proxy check URL.
+      "",
+      // MockCertVerifier to use for testing purposes.
+      scoped_ptr<net::CertVerifier>());
+
+  net::URLRequestContextBuilder builder;
+  net::NetLog net_log;
+  config.ConfigureURLRequestContextBuilder(&builder, &net_log, nullptr);
+  // Set a ProxyConfigService to avoid DCHECK failure when building.
+  builder.set_proxy_config_service(make_scoped_ptr(
+      new net::ProxyConfigServiceFixed(net::ProxyConfig::CreateDirect())));
+  scoped_ptr<net::URLRequestContext> context(builder.Build());
+
+  // Check that AsyncDNS is still enabled when host resolver rules are used
+  EXPECT_TRUE(context->host_resolver()->GetDnsConfigAsValue());
+}
+
 TEST(URLRequestContextConfigTest, SetQuicConnectionMigrationOptions) {
   URLRequestContextConfig config(
       // Enable QUIC.