Add SetSupportsQuic method to explicitly specify server that supports QUIC.

components/cronet/url_request_context_config.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_CRONET_URL_REQUEST_CONTEXT_CONFIG_H_
 #define COMPONENTS_CRONET_URL_REQUEST_CONTEXT_CONFIG_H_
 
 #include <string>
 
 #include "base/json/json_value_converter.h"
 
 namespace net {
 class URLRequestContextBuilder;
 }  // namespace net
 
 namespace cronet {
 
 // Common configuration parameters used by Cronet to configure
 // URLRequestContext. Can be parsed from JSON string passed through JNI.
 struct URLRequestContextConfig {
+  // App-provided hint that server supports QUIC.
+  struct QuicHint {
+    QuicHint();
+    ~QuicHint();
+
+    // Register |converter| for use in converter.Convert().
+    static void RegisterJSONConverter(
+        base::JSONValueConverter<QuicHint>* converter);
+
+    // URL of the server that supports QUIC.
+    std::string server;
+    // Alternate protocol port.
+    int alternate_port;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(QuicHint);
+  };
+
   URLRequestContextConfig();
   ~URLRequestContextConfig();
 
   // Configure |context_builder| based on |this|.
   void ConfigureURLRequestContextBuilder(
       net::URLRequestContextBuilder* context_builder);
 
   // Register |converter| for use in converter.Convert().
   static void RegisterJSONConverter(
       base::JSONValueConverter<URLRequestContextConfig>* converter);
 
   // Enable QUIC.
   bool enable_quic;
   // Enable SPDY.
   bool enable_spdy;
   // Type of http cache: "HTTP_CACHE_DISABLED", "HTTP_CACHE_DISK" or
   // "HTTP_CACHE_IN_MEMORY".
   std::string http_cache;
   // Max size of http cache in bytes.
   int http_cache_max_size;
   // Storage path for http cache and cookie storage.
   std::string storage_path;
+  // App-provided list of servers that support QUIC.
+  ScopedVector<QuicHint> quic_hints;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(URLRequestContextConfig);
 };
 
 }  // namespace cronet
 
 #endif  // COMPONENTS_CRONET_URL_REQUEST_CONTEXT_CONFIG_H_