SPDY4: SpdySession should send SETTINGS acknowledgements.

net/spdy/spdy_test_util_common.h

Index: net/spdy/spdy_test_util_common.h
diff --git a/net/spdy/spdy_test_util_common.h b/net/spdy/spdy_test_util_common.h
index a16cdd8b397a52a92218a752803b9e879d83246e..af052f73b3e64d2c58b052f5eff0b552eab18b78 100644
--- a/net/spdy/spdy_test_util_common.h
+++ b/net/spdy/spdy_test_util_common.h
@@ -366,6 +366,10 @@ class SpdyTestUtil {
   // Returns the constructed frame.  The caller takes ownership of the frame.
   SpdyFrame* ConstructSpdySettings(const SettingsMap& settings) const;
 
+  // Constructs an expected SPDY SETTINGS acknowledgement frame, if the protocol
+  // version is SPDY4 or higher, or an empty placeholder frame otherwise.
+  SpdyFrame* ConstructSpdySettingsAck() const;
+
   // Construct a SPDY PING frame.
   // Returns the constructed frame.  The caller takes ownership of the frame.
   SpdyFrame* ConstructSpdyPing(uint32 ping_id, bool is_ack) const;