Add HttpCache histograms focussed on blocking and transaction type.

net/disk_cache/backend_impl.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/disk_cache/backend_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 1305 matching lines @@
   return CheckAllEntries();
 }
 
 void BackendImpl::FlushIndex() {
   if (index_ && !disabled_)
     index_->Flush();
 }
 
 // ------------------------------------------------------------------------
 
+net::CacheType BackendImpl::GetCacheType() const {
+  return cache_type_;
+}
+
 int32 BackendImpl::GetEntryCount() const {
   if (!index_ || disabled_)
     return 0;
   // num_entries includes entries already evicted.
   int32 not_deleted = data_->header.num_entries -
                       data_->header.lru.sizes[Rankings::DELETED];
 
   if (not_deleted < 0) {
     NOTREACHED();
     not_deleted = 0;
@@ skipping 862 matching lines @@
     if (total_memory > kMaxBuffersSize || total_memory <= 0)
       total_memory = kMaxBuffersSize;
 
     done = true;
   }
 
   return static_cast<int>(total_memory);
 }
 
 }  // namespace disk_cache