Add SetSupportsQuic method to explicitly specify server that supports QUIC.

components/cronet/android/java/src/org/chromium/net/HttpUrlRequest.java

Index: components/cronet/android/java/src/org/chromium/net/HttpUrlRequest.java
diff --git a/components/cronet/android/java/src/org/chromium/net/HttpUrlRequest.java b/components/cronet/android/java/src/org/chromium/net/HttpUrlRequest.java
index 6501d19c61b25f6a6f49069c82cc6e992e5cb0dd..75c8e15fe4a2b16bda638597a0170d75f45b3eea 100644
--- a/components/cronet/android/java/src/org/chromium/net/HttpUrlRequest.java
+++ b/components/cronet/android/java/src/org/chromium/net/HttpUrlRequest.java
@@ -102,6 +102,11 @@ public interface HttpUrlRequest {
     boolean isCanceled();
 
     /**
+     * Returns protocol (e.g. "quic/1+spdy/3") negotiated with server.

[mmenke, 2014/09/09 14:53:35]

Maybe add "Returns empty string if no protocol was negotiated, or the protocol
not known."?

Also, what do we return when using SPDY proxies?  What about CONNECT requests
over SPDY/HTTP proxies?

I don't think it's clear that we don't return HTTP versions (I'm assuming we
don't, at least?)

[Charles, 2014/09/09 17:03:56]

Must be called after onResponseStarted?

[mef, 2014/09/10 16:48:18]

Done.

[mef, 2014/09/10 16:48:18]

Done.
I have no idea. :( Ryan, do you?
Done.

+     */
+    String getNegotiatedProtocol();
+
+    /**
      * Returns the entire response as a ByteBuffer.
      */
     ByteBuffer getByteBuffer();