Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/http2/hpack/decoder/hpack_whole_entry_buffer.cc

 // Copyright 2016 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.
 
 #include "net/http2/hpack/decoder/hpack_whole_entry_buffer.h"
 
 #include "base/logging.h"
 
 using base::StringPiece;
 
@@ skipping 14 matching lines @@
 void HpackWholeEntryBuffer::set_max_string_size_bytes(
     size_t max_string_size_bytes) {
   max_string_size_bytes_ = max_string_size_bytes;
 }
 
 void HpackWholeEntryBuffer::BufferStringsIfUnbuffered() {
   name_.BufferStringIfUnbuffered();
   value_.BufferStringIfUnbuffered();
 }
 
+size_t HpackWholeEntryBuffer::EstimateMemoryUsage() const {
+  return name_.BufferedLength() + value_.BufferedLength();

[DmitrySkiba, 2017/02/02 18:16:27]

Hmm, can we add EMU to HpackDecoderStringBuffer? BufferLength() returns length
of the string it contains, not its capacity. 

[xunjieli, 2017/02/03 22:25:09]

Done.

+}
+
 void HpackWholeEntryBuffer::OnIndexedHeader(size_t index) {
   DVLOG(2) << "HpackWholeEntryBuffer::OnIndexedHeader: index=" << index;
   listener_->OnIndexedHeader(index);
 }
 
 void HpackWholeEntryBuffer::OnStartLiteralHeader(HpackEntryType entry_type,
                                                  size_t maybe_name_index) {
   DVLOG(2) << "HpackWholeEntryBuffer::OnStartLiteralHeader: entry_type="
            << entry_type << ",  maybe_name_index=" << maybe_name_index;
   entry_type_ = entry_type;
@@ skipping 81 matching lines @@
 void HpackWholeEntryBuffer::ReportError(StringPiece error_message) {
   if (!error_detected_) {
     DVLOG(1) << "HpackWholeEntryBuffer::ReportError: " << error_message;
     error_detected_ = true;
     listener_->OnHpackDecodeError(error_message);
     listener_ = HpackWholeEntryNoOpListener::NoOpListener();
   }
 }
 
 }  // namespace net