[HttpCache] Store some memcache info to memory dumps for debugging

net/http/mock_http_cache.cc

 // Copyright (c) 2012 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/http/mock_http_cache.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 497 matching lines @@
 std::unique_ptr<disk_cache::Backend::Iterator> MockDiskCache::CreateIterator() {
   return std::unique_ptr<Iterator>(new NotImplementedIterator());
 }
 
 void MockDiskCache::GetStats(base::StringPairs* stats) {
 }
 
 void MockDiskCache::OnExternalCacheHit(const std::string& key) {
 }
 
-size_t MockDiskCache::EstimateMemoryUsage() const {
-  return 0;
+size_t MockDiskCache::DumpMemoryStats(
+    base::trace_event::ProcessMemoryDump* pmd,
+    const std::string& parent_absolute_name) const {
+  return 0u;
 }
 
 void MockDiskCache::ReleaseAll() {
   EntryMap::iterator it = entries_.begin();
   for (; it != entries_.end(); ++it)
     it->second->Release();
   entries_.clear();
 }
 
 void MockDiskCache::CallbackLater(const CompletionCallback& callback,
@@ skipping 164 matching lines @@
   if (!callback_.is_null()) {
     if (!fail_)
       backend_->reset(new MockDiskCache());
     CompletionCallback cb = callback_;
     callback_.Reset();
     cb.Run(Result());  // This object can be deleted here.
   }
 }
 
 }  // namespace net