Do not drop data on the floor in SpdySession::DoReadLoop.

net/spdy/spdy_session.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_session.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 1380 matching lines @@
         NOTREACHED() << "read_state_: " << read_state_;
         break;
     }
 
     if (availability_state_ == STATE_DRAINING)
       break;
 
     if (result == ERR_IO_PENDING)
       break;
 
-    if (bytes_read_without_yielding > kYieldAfterBytesRead ||
-        time_func_() > yield_after_time) {
-      read_state_ = READ_STATE_DO_READ;
+    if (read_state_ == READ_STATE_DO_READ &&
+        (bytes_read_without_yielding > kYieldAfterBytesRead ||
+         time_func_() > yield_after_time)) {
       base::ThreadTaskRunnerHandle::Get()->PostTask(
           FROM_HERE,
           base::Bind(&SpdySession::PumpReadLoop, weak_factory_.GetWeakPtr(),
                      READ_STATE_DO_READ, OK));
       result = ERR_IO_PENDING;
       break;
     }
   }
 
   CHECK(in_io_loop_);
@@ skipping 1854 matching lines @@
     if (!queue->empty()) {
       SpdyStreamId stream_id = queue->front();
       queue->pop_front();
       return stream_id;
     }
   }
   return 0;
 }
 
 }  // namespace net