Add an async ReadTrailers method to QuicChromiumClientStream::Handle

net/quic/chromium/bidirectional_stream_quic_impl_unittest.cc

 // Copyright 2016 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 "net/quic/chromium/bidirectional_stream_quic_impl.h"
 
 #include <utility>
 
 #include "base/callback_helpers.h"
 #include "base/memory/ptr_util.h"
@@ skipping 299 matching lines @@
   void OnDataRead(int bytes_read) override {
     DCHECK_NE(ON_HEADERS_RECEIVED, phase_);
     if (phase_ == ON_DATA_READ)
       DeleteStream();
     TestDelegateBase::OnDataRead(bytes_read);
   }
 
   void OnTrailersReceived(const SpdyHeaderBlock& trailers) override {
     DCHECK_NE(ON_HEADERS_RECEIVED, phase_);
     DCHECK_NE(ON_DATA_READ, phase_);
+    // Make a copy of |response_headers| before the stream is deleted, since
+    // the headers are owned by the stream.
+    SpdyHeaderBlock trailers_copy = trailers.Clone();
     if (phase_ == ON_TRAILERS_RECEIVED)
       DeleteStream();
-    TestDelegateBase::OnTrailersReceived(trailers);
+    TestDelegateBase::OnTrailersReceived(trailers_copy);
   }
 
   void OnFailed(int error) override {
     DCHECK_EQ(ON_FAILED, phase_);
     DeleteStream();
     TestDelegateBase::OnFailed(error);
   }
 
  private:
   // Indicates in which callback the delegate should cancel or delete the
@@ skipping 1560 matching lines @@
 
   base::RunLoop().RunUntilIdle();
 
   EXPECT_EQ(1, delegate->on_data_read_count());
   EXPECT_EQ(0, delegate->on_data_sent_count());
 }
 
 }  // namespace test
 
 }  // namespace net