[Cronet] Write effective experimental options to NetLog

components/cronet/url_request_context_config.h

Index: components/cronet/url_request_context_config.h
diff --git a/components/cronet/url_request_context_config.h b/components/cronet/url_request_context_config.h
index 3ef5159a37480df1548faa822d191593c2486cc8..69e1b809bb1e0d73d6bf34e5095ba0f0333708e1 100644
--- a/components/cronet/url_request_context_config.h
+++ b/components/cronet/url_request_context_config.h
@@ -16,6 +16,7 @@
 #include "net/cert/cert_verifier.h"
 
 namespace base {
+class DictionaryValue;
 class SequencedTaskRunner;
 }  // namespace base
 
@@ -117,7 +118,7 @@ struct URLRequestContextConfig {
       const std::string& cert_verifier_data);
   ~URLRequestContextConfig();
 
-  // Configure |context_builder| based on |this|.
+  // Configures |context_builder| based on |this|.
   void ConfigureURLRequestContextBuilder(
       net::URLRequestContextBuilder* context_builder,
       net::NetLog* net_log,
@@ -173,6 +174,9 @@ struct URLRequestContextConfig {
   // The list of public key pins.
   ScopedVector<Pkp> pkp_list;
 
+  // Experimental options that are recognized by the config parser.
+  std::unique_ptr<base::DictionaryValue> effective_experimental_options;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextConfig);
 };