Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/spdy_buffer_producer.cc

Index: net/spdy/spdy_buffer_producer.cc
diff --git a/net/spdy/spdy_buffer_producer.cc b/net/spdy/spdy_buffer_producer.cc
index 46d766bb67543ec70c318dd703d7f3fdc0e0aaec..039638ceb3a904b9e2b766e381ec797d649e0c3c 100644
--- a/net/spdy/spdy_buffer_producer.cc
+++ b/net/spdy/spdy_buffer_producer.cc
@@ -7,6 +7,7 @@
 #include <utility>
 
 #include "base/logging.h"
+#include "net/spdy/platform/api/spdy_estimate_memory_usage.h"
 #include "net/spdy/spdy_buffer.h"
 #include "net/spdy/spdy_protocol.h"
 
@@ -26,4 +27,8 @@ std::unique_ptr<SpdyBuffer> SimpleBufferProducer::ProduceBuffer() {
   return std::move(buffer_);
 }
 
+size_t SimpleBufferProducer::EstimateMemoryUsage() const {
+  return SpdyEstimateMemoryUsage(buffer_);
+}
+
 }  // namespace net