Add simple cache backend experiment hidden behind a flag.

chrome/browser/chrome_browser_field_trials.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_
 #define CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/gtest_prod_util.h"
@@ skipping 47 matching lines @@
   void SetUpCacheSensitivityAnalysisFieldTrial();
 
   // Disables the show profile switcher field trial if multi-profiles is not
   // enabled.
   void DisableShowProfileSwitcherTrialIfNecessary();
 
   // A field trial to determine the impact of using non-blocking reads for
   // TCP sockets on Windows instead of overlapped I/O.
   void WindowsOverlappedTCPReadsFieldTrial();
 
+  // A field trial to check the simple cache performance. Currently hidden
+  // behind a flag.
+  // TODO(pasko): adjust the trial parameters and change the flag default.

[SteveT, 2013/03/15 14:07:05]

nit: adjust -> Adjust

[pasko-google - do not use, 2013/03/15 15:36:28]

Done.

+  void SetUpSimpleCacheFieldTrial();
+
   // Instantiates dynamic trials by querying their state, to ensure they get
   // reported as used.
   void InstantiateDynamicTrials();
 
   const CommandLine& parsed_command_line_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserFieldTrials);
 };
 
 #endif  // CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_