Add a new SpdyStream::Delegate method to handle trailers

net/spdy/spdy_stream_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cstddef>
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 157 matching lines @@
   data.RunFor(GetNumReads() + GetNumWrites());
   EXPECT_EQ(ERR_CONNECTION_CLOSED, delegate.WaitForClose());
 
   EXPECT_TRUE(delegate.send_headers_completed());
   EXPECT_EQ("200", delegate.GetResponseHeaderValue(spdy_util_.GetStatusKey()));
   EXPECT_EQ(std::string(kPostBody, kPostBodyLength),
             delegate.TakeReceivedData());
   EXPECT_TRUE(data.AllWriteDataConsumed());
 }
 
+// Delegate that receives trailers.

[Bence, 2015/08/06 15:02:41]

Please confirm (at least using a local build) that this test fails without the
rest of the CL.  You can also consider adding the following comment:
// Regression test for https://crbug.com/481033.

[xunjieli, 2015/08/06 16:10:13]

Confirmed that the test failes without the rest of the CL with a
ERR_SPDY_PROTOCOL_ERROR reported in
SpdyStream::OnAdditionalResponseHeadersReceived. I also tested against the
nghttpd server mentioned in the bug tracker. 

+class StreamDelegateWithTrailers : public test::StreamDelegateWithBody {
+ public:
+  StreamDelegateWithTrailers(const base::WeakPtr<SpdyStream>& stream,
+                             base::StringPiece data)
+      : StreamDelegateWithBody(stream, data) {}
+
+  ~StreamDelegateWithTrailers() override {}
+
+  void OnTrailers(const SpdyHeaderBlock& trailers) override {
+    trailers_ = trailers;
+  }
+
+  const SpdyHeaderBlock& GetTrailers() { return trailers_; }
+
+ private:
+  SpdyHeaderBlock trailers_;
+};
+
+TEST_P(SpdyStreamTest, Trailers) {
+  GURL url(kStreamUrl);
+
+  session_ =
+      SpdySessionDependencies::SpdyCreateSessionDeterministic(&session_deps_);
+
+  scoped_ptr<SpdyFrame> req(spdy_util_.ConstructSpdyPost(
+      kStreamUrl, 1, kPostBodyLength, LOWEST, NULL, 0));
+  AddWrite(*req);
+
+  scoped_ptr<SpdyFrame> msg(
+      spdy_util_.ConstructSpdyBodyFrame(1, kPostBody, kPostBodyLength, true));
+  AddWrite(*msg);
+
+  scoped_ptr<SpdyFrame> resp(spdy_util_.ConstructSpdyPostSynReply(NULL, 0));
+  AddRead(*resp);
+
+  scoped_ptr<SpdyFrame> echo(
+      spdy_util_.ConstructSpdyBodyFrame(1, kPostBody, kPostBodyLength, false));
+  AddRead(*echo);
+
+  const char* const kExtraHeaders[] = {"foo", "bar"};
+  scoped_ptr<SpdyFrame> trailers(
+      spdy_util_.ConstructSpdyHeaderFrame(1, kExtraHeaders, 1));
+  AddRead(*trailers);
+
+  AddReadEOF();
+
+  DeterministicSocketData data(GetReads(), GetNumReads(), GetWrites(),
+                               GetNumWrites());
+  MockConnect connect_data(SYNCHRONOUS, OK);
+  data.set_connect_data(connect_data);
+
+  session_deps_.deterministic_socket_factory->AddSocketDataProvider(&data);
+
+  base::WeakPtr<SpdySession> session(CreateDefaultSpdySession());
+
+  base::WeakPtr<SpdyStream> stream = CreateStreamSynchronously(
+      SPDY_REQUEST_RESPONSE_STREAM, session, url, LOWEST, BoundNetLog());
+  ASSERT_TRUE(stream.get() != NULL);
+
+  StreamDelegateWithTrailers delegate(stream, kPostBodyStringPiece);
+  stream->SetDelegate(&delegate);
+
+  EXPECT_FALSE(stream->HasUrlFromHeaders());
+
+  scoped_ptr<SpdyHeaderBlock> headers(
+      spdy_util_.ConstructPostHeaderBlock(kStreamUrl, kPostBodyLength));
+  EXPECT_EQ(ERR_IO_PENDING,
+            stream->SendRequestHeaders(headers.Pass(), MORE_DATA_TO_SEND));
+  EXPECT_TRUE(stream->HasUrlFromHeaders());
+  EXPECT_EQ(kStreamUrl, stream->GetUrlFromHeaders().spec());
+
+  data.RunFor(GetNumReads() + GetNumWrites());
+  EXPECT_EQ(ERR_CONNECTION_CLOSED, delegate.WaitForClose());
+
+  EXPECT_TRUE(delegate.send_headers_completed());
+  EXPECT_EQ("200", delegate.GetResponseHeaderValue(spdy_util_.GetStatusKey()));
+  const SpdyHeaderBlock& received_trailers = delegate.GetTrailers();
+  SpdyHeaderBlock::const_iterator it = received_trailers.find("foo");
+  EXPECT_EQ("bar", it->second);
+  EXPECT_EQ(std::string(kPostBody, kPostBodyLength),
+            delegate.TakeReceivedData());
+  EXPECT_TRUE(data.AllWriteDataConsumed());
+}
+
 TEST_P(SpdyStreamTest, PushedStream) {
   session_ =
       SpdySessionDependencies::SpdyCreateSessionDeterministic(&session_deps_);
 
   AddReadEOF();
 
   DeterministicSocketData data(GetReads(), GetNumReads(), GetWrites(),
                                GetNumWrites());
   MockConnect connect_data(SYNCHRONOUS, OK);
   data.set_connect_data(connect_data);
@@ skipping 852 matching lines @@
   data.RunFor(1); // FIN
 
   EXPECT_EQ(ERR_CONNECTION_CLOSED, delegate.WaitForClose());
 }
 
 }  // namespace
 
 }  // namespace test
 
 }  // namespace net