SPDY: Add WriteHeaders interface to SpdySession and SpdyStream

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 2975203f433dfe45c08b3f566108e069889b9df5..a2d5e4022d1e1b756b0e0b93fe95b373360a3b85 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -173,6 +173,11 @@ class NET_EXPORT SpdySession : public base::RefCounted<SpdySession>,
                            const std::string& cert,
                            RequestPriority priority);
 
+  // Write a HEADERS frame to the stream.
+  int WriteHeaders(SpdyStreamId stream_id,
+                   const SpdyHeaderBlock& headers,
+                   SpdyControlFlags flags);
+
   // Write a data frame to the stream.
   // Used to create and queue a data frame for the given stream.
   int WriteStreamData(SpdyStreamId stream_id, net::IOBuffer* data,