Makes migration on write error asynchronous to avoid reentrancy issues

net/quic/chromium/quic_chromium_packet_writer.h

Index: net/quic/chromium/quic_chromium_packet_writer.h
diff --git a/net/quic/chromium/quic_chromium_packet_writer.h b/net/quic/chromium/quic_chromium_packet_writer.h
index 72b25adb9004ae305a5c8a78a616a500f1fa2920..8d40b26f0e1e23f7cfe56f92ac030795101949af 100644
--- a/net/quic/chromium/quic_chromium_packet_writer.h
+++ b/net/quic/chromium/quic_chromium_packet_writer.h
@@ -32,10 +32,15 @@ class NET_EXPORT_PRIVATE QuicChromiumPacketWriter : public QuicPacketWriter {
     // |error_code| otherwise.
     virtual int HandleWriteError(int error_code,
                                  scoped_refptr<StringIOBuffer> last_packet) = 0;
+
     // Called to propagate the final write error to the delegate.
     virtual void OnWriteError(int error_code) = 0;
+
     // Called when the writer is unblocked due to a write completion.
     virtual void OnWriteUnblocked() = 0;
+
+    // Called when the writer's IsWriteBlocked is called.
+    virtual bool ShouldWriteBlock() = 0;
   };
 
   QuicChromiumPacketWriter();
@@ -47,7 +52,7 @@ class NET_EXPORT_PRIVATE QuicChromiumPacketWriter : public QuicPacketWriter {
   void set_delegate(Delegate* delegate) { delegate_ = delegate; }
 
   // Writes |packet| to the socket and returns the error code from the write.
-  int WritePacketToSocket(StringIOBuffer* packet);
+  WriteResult WritePacketToSocket(scoped_refptr<StringIOBuffer> packet);
 
   // QuicPacketWriter
   WriteResult WritePacket(const char* buffer,