Add simple cache backend experiment hidden behind a flag.

chrome/browser/chrome_browser_field_trials.h

Index: chrome/browser/chrome_browser_field_trials.h
diff --git a/chrome/browser/chrome_browser_field_trials.h b/chrome/browser/chrome_browser_field_trials.h
index 72af0aeefbca3c4c59e2a17afaa99ccb5771abff..6766b108826d99f0680774544196b9d4d4af2054 100644
--- a/chrome/browser/chrome_browser_field_trials.h
+++ b/chrome/browser/chrome_browser_field_trials.h
@@ -65,6 +65,11 @@ class ChromeBrowserFieldTrials {
   // 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();