Add two small features to the HttpCache for benchmarking/debugging....

net/http/http_cache_unittest.cc

 // Copyright (c) 2006-2008 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.h"
 
 #include "base/hash_tables.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "net/base/net_errors.h"
@@ skipping 1221 matching lines @@
 }
 
 // Ensure that we don't crash by if left-behind transactions.
 TEST(HttpCache, OutlivedTransactions) {
   MockHttpCache* cache = new MockHttpCache;
 
   net::HttpTransaction* trans = cache->http_cache()->CreateTransaction();
   delete cache;
   delete trans;
 }
+
+// Test that the disabled mode works.
+TEST(HttpCache, CacheDisabledMode) {
+  MockHttpCache cache;
+
+  // write to the cache
+  RunTransactionTest(cache.http_cache(), kSimpleGET_Transaction);
+
+  // go into disabled mode
+  cache.http_cache()->set_mode(net::HttpCache::DISABLE);
+
+  // force this transaction to write to the cache again
+  MockTransaction transaction(kSimpleGET_Transaction);
+
+  RunTransactionTest(cache.http_cache(), transaction);
+
+  EXPECT_EQ(2, cache.network_layer()->transaction_count());
+  EXPECT_EQ(0, cache.disk_cache()->open_count());
+  EXPECT_EQ(1, cache.disk_cache()->create_count());
+}