[Cronet] Replace setExperimentalQuicConnectionOptions with a more general API

components/cronet/url_request_context_config.cc

Index: components/cronet/url_request_context_config.cc
diff --git a/components/cronet/url_request_context_config.cc b/components/cronet/url_request_context_config.cc
index 00a79777ecea6c2a87f4899acf762870d8dd728c..78708165d65d17da8d5b3db58bb9ab48a8e6b4b0 100644
--- a/components/cronet/url_request_context_config.cc
+++ b/components/cronet/url_request_context_config.cc
@@ -6,10 +6,12 @@
 
 #include "base/basictypes.h"
 #include "base/json/json_reader.h"
+#include "base/json/json_reader.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/values.h"
+#include "base/values.h"
 #include "net/cert/cert_verifier.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_utils.h"
@@ -19,6 +21,9 @@ namespace cronet {
 
 namespace {
 
+// TODO(xunjieli): Refactor constants in io_thread.cc.
+const char kQuicFieldTrialName[] = "QUIC";
+
 // Using a reference to scoped_ptr is unavoidable because of the semantics of
 // RegisterCustomField.
 // TODO(xunjieli): Remove this once crbug.com/544976 is fixed.
@@ -31,6 +36,30 @@ bool GetMockCertVerifierFromString(
   return success;
 }
 
+void ParseAndSetExperimentalOptions(
+    const std::string& experimental_options,
+    net::URLRequestContextBuilder* context_builder) {
+  if (experimental_options.empty())
+    return;
+
+  scoped_ptr<base::DictionaryValue> dict =
+      base::DictionaryValue::From(base::JSONReader::Read(experimental_options));
+  if (!dict) {
+    DCHECK(false) << "Parsing experimental options failed: "
+                  << experimental_options;
+    return;
+  }
+
+  const base::DictionaryValue* quic_args = nullptr;
+  if (dict->GetDictionary(kQuicFieldTrialName, &quic_args)) {
+    std::string quic_connection_options;
+    if (quic_args->GetString("connection_options", &quic_connection_options)) {
+      context_builder->set_quic_connection_options(
+          net::QuicUtils::ParseQuicConnectionOptions(quic_connection_options));
+    }
+  }
+}
+
 }  // namespace
 
 #define DEFINE_CONTEXT_CONFIG(x) const char REQUEST_CONTEXT_CONFIG_##x[] = #x;
@@ -96,9 +125,10 @@ void URLRequestContextConfig::ConfigureURLRequestContextBuilder(
   }
   context_builder->set_user_agent(user_agent);
   context_builder->SetSpdyAndQuicEnabled(enable_spdy, enable_quic);
-  context_builder->set_quic_connection_options(
-      net::QuicUtils::ParseQuicConnectionOptions(quic_connection_options));
   context_builder->set_sdch_enabled(enable_sdch);
+
+  ParseAndSetExperimentalOptions(experimental_options, context_builder);
+
   if (mock_cert_verifier)
     context_builder->SetCertVerifier(mock_cert_verifier.Pass());
   // TODO(mef): Use |config| to set cookies.
@@ -126,8 +156,9 @@ void URLRequestContextConfig::RegisterJSONConverter(
   converter->RegisterRepeatedMessage(REQUEST_CONTEXT_CONFIG_QUIC_HINTS,
                                      &URLRequestContextConfig::quic_hints);
   converter->RegisterStringField(
-      REQUEST_CONTEXT_CONFIG_QUIC_OPTIONS,
-      &URLRequestContextConfig::quic_connection_options);
+      REQUEST_CONTEXT_CONFIG_EXPERIMENTAL_OPTIONS,
+      &URLRequestContextConfig::experimental_options);
+
   converter->RegisterStringField(
       REQUEST_CONTEXT_CONFIG_DATA_REDUCTION_PRIMARY_PROXY,
       &URLRequestContextConfig::data_reduction_primary_proxy);