Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/spdy_buffer.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_BUFFER_H_
 #define NET_SPDY_SPDY_BUFFER_H_
 
 #include <cstddef>
 #include <memory>
 #include <vector>
@@ skipping 65 matching lines @@
   // Returns an IOBuffer pointing to the data starting at
   // GetRemainingData(). Use with care; the returned IOBuffer is not
   // updated when Consume() is called. However, it may still be used
   // past the lifetime of this object.
   //
   // This is used with Socket::Write(), which takes an IOBuffer* that
   // may be written to even after the socket itself is destroyed. (See
   // http://crbug.com/249725 .)
   IOBuffer* GetIOBufferForRemainingData();
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   void ConsumeHelper(size_t consume_size, ConsumeSource consume_source);
 
   // Ref-count the passed-in SpdySerializedFrame to support the semantics of
   // |GetIOBufferForRemainingData()|.
   typedef base::RefCountedData<std::unique_ptr<SpdySerializedFrame>>
       SharedFrame;
 
   class SharedFrameIOBuffer;
 
   const scoped_refptr<SharedFrame> shared_frame_;
   std::vector<ConsumeCallback> consume_callbacks_;
   size_t offset_;
 
   DISALLOW_COPY_AND_ASSIGN(SpdyBuffer);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_BUFFER_H_