Account for HTTP/2 padding in receive windows.

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 "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 508 matching lines @@
 
   // Track our bandwidth.
   metrics_.RecordBytes(length);
   recv_bytes_ += length;
   recv_last_byte_time_ = base::TimeTicks::Now();
 
   // May close |this|.
   delegate_->OnDataReceived(buffer.Pass());
 }
 
+void SpdyStream::OnPaddingConsumed(size_t len) {
+  if (session_->flow_control_state() >= SpdySession::FLOW_CONTROL_STREAM) {
+    // Decrease window size because padding bytes are received.
+    // Increase window size because padding bytes are consumed (by discarding).
+    // Net result: |session_unacked_recv_window_bytes_| increases by |len|,
+    // |session_recv_window_size_| does not change.
+    DecreaseRecvWindowSize(static_cast<int32>(len));
+    IncreaseRecvWindowSize(static_cast<int32>(len));
+  }
+}
+
 void SpdyStream::OnFrameWriteComplete(SpdyFrameType frame_type,
                                       size_t frame_size) {
   DCHECK_NE(type_, SPDY_PUSH_STREAM);
 
   if (frame_size < session_->GetFrameMinimumSize() ||
       frame_size > session_->GetFrameMaximumSize()) {
     NOTREACHED();
     return;
   }
   CHECK(frame_type == SYN_STREAM ||
@@ skipping 373 matching lines @@
       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
                                        state);
       break;
   }
   return description;
 }
 
 #undef STATE_CASE
 
 }  // namespace net