Add HttpCache histograms focussed on blocking and transaction type.

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 "base/bind.h"
 #include "base/message_loop.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_errors.h"
@@ skipping 321 matching lines @@
 
 MockDiskCache::MockDiskCache()
     : open_count_(0), create_count_(0), fail_requests_(false),
       soft_failures_(false), double_create_check_(true) {
 }
 
 MockDiskCache::~MockDiskCache() {
   ReleaseAll();
 }
 
+net::CacheType MockDiskCache::GetCacheType() const {
+  return net::DISK_CACHE;
+}
+
 int32 MockDiskCache::GetEntryCount() const {
   return static_cast<int32>(entries_.size());
 }
 
 int MockDiskCache::OpenEntry(const std::string& key, disk_cache::Entry** entry,
                              const net::CompletionCallback& callback) {
   DCHECK(!callback.is_null());
   if (fail_requests_)
     return net::ERR_CACHE_OPEN_FAILURE;
 
@@ skipping 253 matching lines @@
 void MockBlockingBackendFactory::FinishCreation() {
   block_ = false;
   if (!callback_.is_null()) {
     if (!fail_)
       *backend_ = new MockDiskCache();
     net::CompletionCallback cb = callback_;
     callback_.Reset();
     cb.Run(Result());  // This object can be deleted here.
   }
 }