Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/spdy_stream.cc

Index: net/spdy/spdy_stream.cc
diff --git a/net/spdy/spdy_stream.cc b/net/spdy/spdy_stream.cc
index e00ae2140c35d47cf8f4fb9af4e5dab490ea9890..4528e9ccf263f161506f5402884349002a0adcf9 100644
--- a/net/spdy/spdy_stream.cc
+++ b/net/spdy/spdy_stream.cc
@@ -19,6 +19,7 @@
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "base/trace_event/memory_usage_estimator.h"
 #include "base/values.h"
 #include "net/log/net_log.h"
 #include "net/log/net_log_capture_mode.h"
@@ -820,6 +821,16 @@ bool SpdyStream::GetLoadTimingInfo(LoadTimingInfo* load_timing_info) const {
   return result;
 }
 
+size_t SpdyStream::EstimateMemoryUsage() const {
+  // TODO(xunjieli): https://crbug.com/669108. Estimate |pending_send_data_|
+  // once scoped_refptr support is in.
+  return base::trace_event::EstimateMemoryUsage(url_) +
+         base::trace_event::EstimateMemoryUsage(request_headers_) +
+         base::trace_event::EstimateMemoryUsage(url_from_header_block_) +
+         base::trace_event::EstimateMemoryUsage(pending_recv_data_) +
+         base::trace_event::EstimateMemoryUsage(response_headers_);
+}
+
 void SpdyStream::UpdateHistograms() {
   // We need at least the receive timers to be filled in, as otherwise
   // metrics can be bogus.