Increase the QUIC header size limit to 256KB from 16KB.

net/quic/chromium/mock_quic_data.h

Index: net/quic/chromium/mock_quic_data.h
diff --git a/net/quic/chromium/mock_quic_data.h b/net/quic/chromium/mock_quic_data.h
index c58ce2e210b478d08b9d0efd7b7b29417f2e557d..980cdb72a5d9660398c1b4dfcf79a5cc2731c3eb 100644
--- a/net/quic/chromium/mock_quic_data.h
+++ b/net/quic/chromium/mock_quic_data.h
@@ -38,6 +38,10 @@ class MockQuicData {
   // |packet|.
   void AddWrite(std::unique_ptr<QuicEncryptedPacket> packet);
 
+  // Adds an asynchronous write at the next sequence number which will write
+  // |packet|.
+  void AddAsyncWrite(std::unique_ptr<QuicEncryptedPacket> packet);
+
   // Adds a write at the next sequence number which will return |rv| either
   // synchronously or asynchronously based on |mode|.
   void AddWrite(IoMode mode, int rv);