Add SetSupportsQuic method to explicitly specify server that supports QUIC.

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 b295d02fb98fbac12c8731d8c81805dcf99b5fb2..d7400d560f4a630a42e4f6c515e4898e6ea3def9 100644
--- a/components/cronet/url_request_context_config.h
+++ b/components/cronet/url_request_context_config.h
@@ -18,6 +18,24 @@ 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();
 
@@ -40,6 +58,11 @@ struct URLRequestContextConfig {
   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