Track SimpleCache memory usage in net/ MemoryDumpProvider

net/http/http_cache_transaction.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/http_cache_transaction.h"
 
 #include "build/build_config.h"  // For OS_POSIX
 
 #if defined(OS_POSIX)
 #include <unistd.h>
@@ skipping 559 matching lines @@
     ConnectionAttempts* out) const {
   ConnectionAttempts new_connection_attempts;
   if (network_trans_)
     network_trans_->GetConnectionAttempts(&new_connection_attempts);
 
   out->swap(new_connection_attempts);
   out->insert(out->begin(), old_connection_attempts_.begin(),
               old_connection_attempts_.end());
 }
 
+size_t HttpCache::Transaction::EstimateMemoryUsage() const {
+  // TODO(xunjieli): Consider improving the coverage. crbug.com/669108.
+  return 0;
+}
+
 //-----------------------------------------------------------------------------
 
 // A few common patterns: (Foo* means Foo -> FooComplete)
 //
 // 1. Not-cached entry:
 //   Start():
 //   GetBackend* -> InitEntry -> OpenEntry* -> CreateEntry* -> AddToEntry* ->
 //   SendRequest* -> SuccessfulSendRequest -> OverwriteCachedResponse ->
 //   CacheWriteResponse* -> TruncateCachedData* -> TruncateCachedMetadata* ->
 //   PartialHeadersReceived
@@ skipping 2405 matching lines @@
     default:
       NOTREACHED();
   }
 }
 
 void HttpCache::Transaction::OnIOComplete(int result) {
   DoLoop(result);
 }
 
 }  // namespace net