Added a debug info UI for Blimp

blimp/net/packet_writer.h

Index: blimp/net/packet_writer.h
diff --git a/blimp/net/packet_writer.h b/blimp/net/packet_writer.h
index 7f9b18be043e1d77a69413ae3ae4c7033159be91..e2b94a716f10bdbe9ff218ed5a771876e6dd6151 100644
--- a/blimp/net/packet_writer.h
+++ b/blimp/net/packet_writer.h
@@ -15,6 +15,8 @@
 
 namespace blimp {
 
+class BlimpConnectionStatistics;
+
 // Interface to describe a writer which can write variable-length data packets
 // to a connection.
 class BLIMP_NET_EXPORT PacketWriter {
@@ -26,6 +28,13 @@ class BLIMP_NET_EXPORT PacketWriter {
   // |callback| must not be invoked if |this| is deleted.
   virtual void WritePacket(const scoped_refptr<net::DrainableIOBuffer>& data,
                            const net::CompletionCallback& callback) = 0;
+
+  void set_blimp_connection_statistics(BlimpConnectionStatistics* statistics) {
+    blimp_connection_statistics_ = statistics;
+  }
+
+ protected:
+  BlimpConnectionStatistics* blimp_connection_statistics_ = nullptr;
 };
 
 }  // namespace blimp