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

net/spdy/spdy_session.h

Index: net/spdy/spdy_session.h
diff --git a/net/spdy/spdy_session.h b/net/spdy/spdy_session.h
index 0e0d08b80fc42af857c97763832f1a7e30fa4dcb..4bbda1b4673c848698a29146a2282401f771e182 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -812,6 +812,10 @@ class NET_EXPORT SpdySession : public BufferedSpdyFramerVisitorInterface,
   // that |stream| may hold the last reference to the session.
   void DeleteStream(std::unique_ptr<SpdyStream> stream, int status);
 
+  // Returns the stream id of the push stream if it is not claimed yet, or 0
+  // otherwise.
+  SpdyStreamId GetStreamIdForPush(const GURL& url);
+
   // Check if we have a pending pushed-stream for this url
   // Returns the stream if found (and returns it from the pending
   // list). Returns NULL otherwise.