Add SetSupportsQuic method to explicitly specify server that supports QUIC.

components/cronet/android/chromium_url_request_context.cc

Index: components/cronet/android/chromium_url_request_context.cc
diff --git a/components/cronet/android/chromium_url_request_context.cc b/components/cronet/android/chromium_url_request_context.cc
index f870adfe242d0a14d086ad01af4d754e15a13f39..d5c62cfdf91faee508f2d523f8b6bb60cba3ff90 100644
--- a/components/cronet/android/chromium_url_request_context.cc
+++ b/components/cronet/android/chromium_url_request_context.cc
@@ -18,6 +18,7 @@
 #include "components/cronet/android/url_request_context_adapter.h"
 #include "components/cronet/url_request_context_config.h"
 #include "jni/ChromiumUrlRequestContext_jni.h"
+#include "net/base/host_port_pair.h"
 
 namespace {
 
@@ -147,4 +148,20 @@ static void StopNetLog(JNIEnv* env,
   adapter->StopNetLog();
 }
 
+static void SetSupportsQuic(JNIEnv* env,
+                            jobject jcaller,
+                            jlong urlRequestContextAdapter,
+                            jstring server,
+                            jint alternate_port,
+                            jfloat probability) {
+  URLRequestContextAdapter* adapter =
+      reinterpret_cast<URLRequestContextAdapter*>(urlRequestContextAdapter);
+
+  GURL server_url(base::android::ConvertJavaStringToUTF8(env, server));
+
+  adapter->SetSupportsQuic(net::HostPortPair::FromURL(server_url),
+                           static_cast<uint16>(alternate_port),
+                           static_cast<double>(probability));
+}
+
 }  // namespace cronet