Log compressed size of HTTP/2 requests.

net/spdy/spdy_headers_handler_interface.h

Index: net/spdy/spdy_headers_handler_interface.h
diff --git a/net/spdy/spdy_headers_handler_interface.h b/net/spdy/spdy_headers_handler_interface.h
index 2c48abfe94120ad9dde1aae9cf4bc8c875b83be0..e4652ddef8be2afaf89c1f2118ffaadee34d26a5 100644
--- a/net/spdy/spdy_headers_handler_interface.h
+++ b/net/spdy/spdy_headers_handler_interface.h
@@ -27,10 +27,18 @@ class NET_EXPORT_PRIVATE SpdyHeadersHandlerInterface {
   // values for a given key will be emitted as multiple calls to OnHeader.
   virtual void OnHeader(base::StringPiece key, base::StringPiece value) = 0;
 
+  // TODO(yasong): deprecate this method with
+  // --gfe2_reloadable_flag_log_compressed_size.
   // A callback method which notifies when the parser finishes handling a
   // header block (i.e. the containing frame has the END_HEADERS flag set).
   // Also indicates the total number of bytes in this block.
   virtual void OnHeaderBlockEnd(size_t uncompressed_header_bytes) = 0;
+
+  // A callback method which notifies when the parser finishes handling a
+  // header block (i.e. the containing frame has the END_HEADERS flag set).
+  // Also indicates the total number of bytes in this block.
+  virtual void OnHeaderBlockEnd(size_t uncompressed_header_bytes,
+                                size_t compressed_header_bytes) = 0;
 };
 
 }  // namespace net