Propagate SetDecoderHeaderTableDebugVisitor to the nested SpdyFramerDecoderAdapter.

net/spdy/spdy_framer.cc

Index: net/spdy/spdy_framer.cc
diff --git a/net/spdy/spdy_framer.cc b/net/spdy/spdy_framer.cc
index 0901fe4c38b21b42b1f795ed5607e29f7a1593f6..e70abe01d4f3b94820b54959094efceadc07da4c 100644
--- a/net/spdy/spdy_framer.cc
+++ b/net/spdy/spdy_framer.cc
@@ -3222,7 +3222,11 @@ bool SpdyFramer::IncrementallyDeliverControlFrameHeaderData(
 
 void SpdyFramer::SetDecoderHeaderTableDebugVisitor(
     std::unique_ptr<HpackHeaderTable::DebugVisitorInterface> visitor) {
-  GetHpackDecoder()->SetHeaderTableDebugVisitor(std::move(visitor));
+  if (decoder_adapter_ != nullptr) {
+    decoder_adapter_->SetDecoderHeaderTableDebugVisitor(std::move(visitor));
+  } else {
+    GetHpackDecoder()->SetHeaderTableDebugVisitor(std::move(visitor));
+  }
 }
 
 void SpdyFramer::SetEncoderHeaderTableDebugVisitor(