http2: Update priorities of pushed streams

net/spdy/spdy_stream.cc

 // Copyright (c) 2012 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/spdy/spdy_stream.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 571 matching lines @@
   base::WeakPtr<SpdyStream> weak_this = GetWeakPtr();
   // May close the stream.
   DecreaseRecvWindowSize(static_cast<int32_t>(len));
   if (!weak_this)
     return;
   IncreaseRecvWindowSize(static_cast<int32_t>(len));
 }
 
 void SpdyStream::OnFrameWriteComplete(SpdyFrameType frame_type,
                                       size_t frame_size) {
+  // PRIORITY writes are allowed at any time and do not trigger a state update.
+  if (frame_type == PRIORITY) {
+    return;
+  }
+
   DCHECK_NE(type_, SPDY_PUSH_STREAM);
   CHECK(frame_type == HEADERS || frame_type == DATA) << frame_type;
 
   int result =
       (frame_type == HEADERS) ? OnHeadersSent() : OnDataSent(frame_size);
   if (result == ERR_IO_PENDING) {
     // The write operation hasn't completed yet.
     return;
   }
 
@@ skipping 333 matching lines @@
       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
                                        state);
       break;
   }
   return description;
 }
 
 #undef STATE_CASE
 
 }  // namespace net