HPACK: Add HpackHuffmanTable::EncodedSize()

net/spdy/hpack_huffman_table.h

Index: net/spdy/hpack_huffman_table.h
diff --git a/net/spdy/hpack_huffman_table.h b/net/spdy/hpack_huffman_table.h
index 8f1ada912f1216de9f1104bb9be6793ed9be845f..f776ddd2887e63dccabd9e026a5f54b36cbc5a53 100644
--- a/net/spdy/hpack_huffman_table.h
+++ b/net/spdy/hpack_huffman_table.h
@@ -77,6 +77,9 @@ class NET_EXPORT_PRIVATE HpackHuffmanTable {
   // context.
   void EncodeString(base::StringPiece in, HpackOutputStream* out) const;
 
+  // Returns the encoded size of the input string.
+  size_t EncodedSize(base::StringPiece in) const;
+
   // Decodes symbols from |in| into |out|. It is the caller's responsibility
   // to ensure |out| has a reserved a sufficient buffer to hold decoded output.
   // DecodeString() halts when |in| runs out of input, in which case true is