SimpleCache: read small files all at once.

net/disk_cache/disk_cache_test_base.h

Index: net/disk_cache/disk_cache_test_base.h
diff --git a/net/disk_cache/disk_cache_test_base.h b/net/disk_cache/disk_cache_test_base.h
index aa91ed74c7f4d630d77eebf5f3d2fd8c1c7b6a01..fb44387320cad225613078737252737e08f094d6 100644
--- a/net/disk_cache/disk_cache_test_base.h
+++ b/net/disk_cache/disk_cache_test_base.h
@@ -12,6 +12,8 @@
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
+#include "base/metrics/field_trial.h"
+#include "base/test/scoped_feature_list.h"
 #include "base/threading/thread.h"
 #include "net/base/cache_type.h"
 #include "net/disk_cache/disk_cache.h"
@@ -189,6 +191,10 @@ class DiskCacheTestWithCache : public DiskCacheTest {
   void InitMemoryCache();
   void InitDiskCache();
 
+  // Need to have the one "global" trial list before we change things.
+  std::unique_ptr<base::FieldTrialList> field_trial_list_;
+  base::test::ScopedFeatureList scoped_feature_list_;
+
   base::Thread cache_thread_;
   DISALLOW_COPY_AND_ASSIGN(DiskCacheTestWithCache);
 };