Change the interface of GetAlternativeServicesFor, always return the best Alt-Svc entry.

net/quic/test_tools/quic_test_packet_maker.h

Index: net/quic/test_tools/quic_test_packet_maker.h
diff --git a/net/quic/test_tools/quic_test_packet_maker.h b/net/quic/test_tools/quic_test_packet_maker.h
index 6609f511f0dacd66907f1bdc4093b5ddb6c071dd..2cff278ba03588a0c6bc5bba4059b6baedf80204 100644
--- a/net/quic/test_tools/quic_test_packet_maker.h
+++ b/net/quic/test_tools/quic_test_packet_maker.h
@@ -55,6 +55,12 @@ class QuicTestPacketMaker {
       QuicPacketNumber largest_received,
       QuicPacketNumber least_unacked,
       bool send_feedback);
+  scoped_ptr<QuicEncryptedPacket> MakeAckPacket(
+      QuicPacketNumber packet_number,
+      QuicPacketNumber largest_received,
+      QuicPacketNumber ack_least_unacked,
+      QuicPacketNumber stop_least_unacked,
+      bool send_feedback);
   scoped_ptr<QuicEncryptedPacket> MakeDataPacket(QuicPacketNumber packet_number,
                                                  QuicStreamId stream_id,
                                                  bool should_include_version,
@@ -73,15 +79,26 @@ class QuicTestPacketMaker {
       const SpdyHeaderBlock& headers,
       size_t* spdy_headers_frame_length);
 
+  scoped_ptr<QuicEncryptedPacket> MakeRequestHeadersPacket(
+      QuicPacketNumber packet_number,
+      QuicStreamId stream_id,
+      bool should_include_version,
+      bool fin,
+      SpdyPriority priority,
+      const SpdyHeaderBlock& headers,
+      size_t* spdy_headers_frame_length,
+      QuicStreamOffset* offset);
+
   // Convenience method for calling MakeRequestHeadersPacket with nullptr for
   // |spdy_headers_frame_length|.
-  scoped_ptr<QuicEncryptedPacket> MakeRequestHeadersPacket(
+  scoped_ptr<QuicEncryptedPacket> MakeRequestHeadersPacketWithOffsetTracking(
       QuicPacketNumber packet_number,
       QuicStreamId stream_id,
       bool should_include_version,
       bool fin,
       SpdyPriority priority,
-      const SpdyHeaderBlock& headers);
+      const SpdyHeaderBlock& headers,
+      QuicStreamOffset* offset);
 
   // If |spdy_headers_frame_length| is non-null, it will be set to the size of
   // the SPDY headers frame created for this packet.
@@ -91,22 +108,35 @@ class QuicTestPacketMaker {
       bool should_include_version,
       bool fin,
       const SpdyHeaderBlock& headers,
+      size_t* spdy_headers_frame_length,
+      QuicStreamOffset* offset);
+
+  scoped_ptr<QuicEncryptedPacket> MakeResponseHeadersPacket(
+      QuicPacketNumber packet_number,
+      QuicStreamId stream_id,
+      bool should_include_version,
+      bool fin,
+      const SpdyHeaderBlock& headers,
       size_t* spdy_headers_frame_length);
 
   // Convenience method for calling MakeResponseHeadersPacket with nullptr for
   // |spdy_headers_frame_length|.
-  scoped_ptr<QuicEncryptedPacket> MakeResponseHeadersPacket(
+  scoped_ptr<QuicEncryptedPacket> MakeResponseHeadersPacketWithOffsetTracking(
       QuicPacketNumber packet_number,
       QuicStreamId stream_id,
       bool should_include_version,
       bool fin,
-      const SpdyHeaderBlock& headers);
+      const SpdyHeaderBlock& headers,
+      QuicStreamOffset* offset);
 
   SpdyHeaderBlock GetRequestHeaders(const std::string& method,
                                     const std::string& scheme,
                                     const std::string& path);
   SpdyHeaderBlock GetResponseHeaders(const std::string& status);
 
+  SpdyHeaderBlock GetResponseHeaders(const std::string& status,
+                                     const std::string& alt_svc);
+
  private:
   scoped_ptr<QuicEncryptedPacket> MakePacket(
       const QuicPacketHeader& header,