[DevTools] Properly handle cache-only requests when cache is disabled

net/http/http_cache_unittest.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.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 6752 matching lines @@
   // Skipping cache validation should still return a response.
   transaction.load_flags = LOAD_ONLY_FROM_CACHE | LOAD_SKIP_CACHE_VALIDATION;
   RunTransactionTest(cache.http_cache(), transaction);
 
   // If the cache entry is checked for validitiy, it should fail.
   transaction.load_flags = LOAD_ONLY_FROM_CACHE;
   transaction.return_code = ERR_CACHE_MISS;
   RunTransactionTest(cache.http_cache(), transaction);
 }
 
+TEST(HttpCache, InvalidLoadFlagCombination) {
+  MockHttpCache cache;
+
+  // Put the resource in the cache.
+  RunTransactionTest(cache.http_cache(), kSimpleGET_Transaction);
+
+  // Now try to fetch it again, but with a flag combination disallowing both
+  // cache and network access.
+  ScopedMockTransaction transaction(kSimpleGET_Transaction);
+  // DevTools relies on this combination of flags for "disable cache" mode
+  // when a resource is only supposed to be loaded from cache.
+  transaction.load_flags = LOAD_ONLY_FROM_CACHE | LOAD_BYPASS_CACHE;
+  transaction.return_code = ERR_CACHE_MISS;
+  RunTransactionTest(cache.http_cache(), transaction);
+}
+
 // Tests that we can read metadata after validating the entry and with READ mode
 // transactions.
 TEST(HttpCache, ReadMetadata) {
   MockHttpCache cache;
 
   // Write to the cache
   HttpResponseInfo response;
   RunTransactionTestWithResponseInfo(cache.http_cache(),
                                      kTypicalGET_Transaction, &response);
   EXPECT_TRUE(response.metadata.get() == NULL);
@@ skipping 1346 matching lines @@
   RunTransactionTestWithResponseInfo(cache.http_cache(),
                                      kTypicalGET_Transaction, &response_info);
 
   EXPECT_FALSE(response_info.was_cached);
   EXPECT_TRUE(response_info.network_accessed);
   EXPECT_EQ(CacheEntryStatus::ENTRY_CANT_CONDITIONALIZE,
             response_info.cache_entry_status);
 }
 
 }  // namespace net