Add methods in spdy/quic session to get stream id of pushed stream given the request url

net/quic/chromium/quic_chromium_client_session.h

Index: net/quic/chromium/quic_chromium_client_session.h
diff --git a/net/quic/chromium/quic_chromium_client_session.h b/net/quic/chromium/quic_chromium_client_session.h
index f9aa8b81fa26389aec08c30829c17000167b70c2..1862133ccac84aa566607b405cb0ddd9deeb0548 100644
--- a/net/quic/chromium/quic_chromium_client_session.h
+++ b/net/quic/chromium/quic_chromium_client_session.h
@@ -234,6 +234,10 @@ class NET_EXPORT_PRIVATE QuicChromiumClientSession
   // than the number of round-trips needed for the handshake.
   int GetNumSentClientHellos() const;
 
+  // Returns the stream id of the push stream if it is not claimed yet, or 0
+  // otherwise.
+  QuicStreamId GetStreamIdForPush(const GURL& pushed_url);
+
   // Returns true if |hostname| may be pooled onto this session.  If this
   // is a secure QUIC session, then |hostname| must match the certificate
   // presented during the handshake.