Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/spdy_write_queue.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_SPDY_SPDY_WRITE_QUEUE_H_
 #define NET_SPDY_SPDY_WRITE_QUEUE_H_
 
 #include <deque>
 #include <memory>
 
@@ skipping 41 matching lines @@
   // non-NULL.
   void RemovePendingWritesForStream(const base::WeakPtr<SpdyStream>& stream);
 
   // Removes all pending writes for streams after |last_good_stream_id|
   // and streams with no stream id.
   void RemovePendingWritesForStreamsAfter(SpdyStreamId last_good_stream_id);
 
   // Removes all pending writes.
   void Clear();
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   // A struct holding a frame producer and its associated stream.
   struct PendingWrite {
     SpdyFrameType frame_type;
     std::unique_ptr<SpdyBufferProducer> frame_producer;
     base::WeakPtr<SpdyStream> stream;
     // Whether |stream| was non-NULL when enqueued.
     bool has_stream;
 
     PendingWrite();
     PendingWrite(SpdyFrameType frame_type,
                  std::unique_ptr<SpdyBufferProducer> frame_producer,
                  const base::WeakPtr<SpdyStream>& stream);
     ~PendingWrite();
     PendingWrite(PendingWrite&& other);
     PendingWrite& operator=(PendingWrite&& other);
 
+    size_t EstimateMemoryUsage() const;
+
     DISALLOW_COPY_AND_ASSIGN(PendingWrite);
   };
 
   bool removing_writes_;
 
   // The actual write queue, binned by priority.
   std::deque<PendingWrite> queue_[NUM_PRIORITIES];
 
   DISALLOW_COPY_AND_ASSIGN(SpdyWriteQueue);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_WRITE_QUEUE_H_