Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/spdy_framer_decoder_adapter.h

Index: net/spdy/spdy_framer_decoder_adapter.h
diff --git a/net/spdy/spdy_framer_decoder_adapter.h b/net/spdy/spdy_framer_decoder_adapter.h
index 293b6c3537e010ab90fd1cc833b34d040bd2b7ea..84f709dd02d2a9ed356f6fb7f8ac3f8712264b0b 100644
--- a/net/spdy/spdy_framer_decoder_adapter.h
+++ b/net/spdy/spdy_framer_decoder_adapter.h
@@ -75,6 +75,9 @@ class SpdyFramerDecoderAdapter {
   // has responded with an HTTP/1.1 (or earlier) response.
   virtual bool probable_http_response() const = 0;
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  virtual size_t EstimateMemoryUsage() const = 0;
+
  private:
   SpdyFramerVisitorInterface* visitor_ = nullptr;
   SpdyFramerDebugVisitorInterface* debug_visitor_ = nullptr;