Fix bug in percentage increase computation for cache sensitivity analysis,

chrome/browser/chrome_browser_field_trials.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 "chrome/browser/chrome_browser_field_trials.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 555 matching lines @@
   trial->AppendGroup("Yes", infinite_cache_probability);
   trial->AppendGroup("Control", infinite_cache_probability);
 }
 
 void ChromeBrowserFieldTrials::SetUpCacheSensitivityAnalysisFieldTrial() {
   const base::FieldTrial::Probability kDivisor = 100;
 
 #if (defined(OS_ANDROID) || defined(OS_IOS))
   base::FieldTrial::Probability sensitivity_analysis_probability = 0;
 #else
-  base::FieldTrial::Probability sensitivity_analysis_probability = 20;
+  base::FieldTrial::Probability sensitivity_analysis_probability = 8;

[rvargas (doing something else), 2012/10/03 02:01:09]

50% of canary is delayed? can we lower this percentage?

[tburkard, 2012/10/03 16:47:21]

Eventually, yes.  However, at this point, I need more data.  The data coming in
so far already shows that the impact on users is negligible (~2% slowdown), so
this is not a big deal in terms of user impact.  I want to leave this in Dev for
a week to get better data, then I'll reduce it.  SG?

 #endif
 
   scoped_refptr<base::FieldTrial> trial(
       base::FieldTrialList::FactoryGetFieldTrial("CacheSensitivityAnalysis",
                                                  kDivisor, "No",
                                                  2012, 12, 31, NULL));
-  trial->AppendGroup("Control", sensitivity_analysis_probability);
-  trial->AppendGroup("100", sensitivity_analysis_probability);
+  trial->AppendGroup("ControlA", sensitivity_analysis_probability);
+  trial->AppendGroup("ControlB", sensitivity_analysis_probability);
+  trial->AppendGroup("100A", sensitivity_analysis_probability);
+  trial->AppendGroup("100B", sensitivity_analysis_probability);
+  trial->AppendGroup("200A", sensitivity_analysis_probability);
+  trial->AppendGroup("200B", sensitivity_analysis_probability);
+  trial->AppendGroup("400A", sensitivity_analysis_probability);
+  trial->AppendGroup("400B", sensitivity_analysis_probability);
 }