Revert 148639 - Clean up Prerender field trials.

chrome/browser/prerender/prerender_field_trial.cc

Index: chrome/browser/prerender/prerender_field_trial.cc
===================================================================
--- chrome/browser/prerender/prerender_field_trial.cc	(revision 148642)
+++ chrome/browser/prerender/prerender_field_trial.cc	(working copy)
@@ -16,9 +16,6 @@
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
 
-using base::FieldTrial;
-using base::FieldTrialList;
-
 namespace prerender {
 
 namespace {
@@ -37,10 +34,10 @@
     return;
   }
 
-  const FieldTrial::Probability divisor = 1000;
-  const FieldTrial::Probability prefetch_probability = 500;
-  scoped_refptr<FieldTrial> trial(
-      FieldTrialList::FactoryGetFieldTrial(
+  const base::FieldTrial::Probability divisor = 1000;
+  const base::FieldTrial::Probability prefetch_probability = 500;
+  scoped_refptr<base::FieldTrial> trial(
+      base::FieldTrialList::FactoryGetFieldTrial(
           "Prefetch", divisor, "ContentPrefetchPrefetchOff",
           2013, 6, 30, NULL));
   const int kPrefetchOnGroup = trial->AppendGroup("ContentPrefetchPrefetchOn",
@@ -49,76 +46,77 @@
 }
 
 void SetupPrerenderFieldTrial() {
-  const FieldTrial::Probability divisor = 1000;
+  base::FieldTrial::Probability divisor = 1000;
 
-  FieldTrial::Probability prerender_enabled_probability;
-  FieldTrial::Probability control_probability;
-  FieldTrial::Probability experiment_5min_ttl_probability;
-  FieldTrial::Probability experiment_no_use_probability;
+  base::FieldTrial::Probability exp1_probability = 166;
+  base::FieldTrial::Probability exp1_5min_ttl_probability = 83;
+  base::FieldTrial::Probability control1_probability = 166;
+  base::FieldTrial::Probability no_use1_probability = 83;
 
+  base::FieldTrial::Probability exp2_probability = 167;
+  base::FieldTrial::Probability exp2_5min_ttl_probability = 84;
+  base::FieldTrial::Probability control2_probability = 167;
+  base::FieldTrial::Probability no_use2_probability = 84;
+
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
   if (channel == chrome::VersionInfo::CHANNEL_STABLE ||
       channel == chrome::VersionInfo::CHANNEL_BETA) {
-    // Use very conservatives and stable settings in beta and stable.
-    const FieldTrial::Probability release_prerender_enabled_probability = 980;
-    const FieldTrial::Probability release_control_probability = 10;
-    const FieldTrial::Probability release_experiment_5min_ttl_probability = 10;
-    const FieldTrial::Probability release_experiment_no_use_probability = 0;
-    COMPILE_ASSERT(
-        release_prerender_enabled_probability + release_control_probability +
-        release_experiment_5min_ttl_probability +
-        release_experiment_no_use_probability == divisor,
-        release_experiment_probabilities_must_equal_divisor);
-
-    prerender_enabled_probability = release_prerender_enabled_probability;
-    control_probability = release_experiment_5min_ttl_probability;
-    experiment_5min_ttl_probability = release_control_probability;
-    experiment_no_use_probability = release_experiment_no_use_probability;
-  } else {
-    // In testing channels, use more experiments and a larger control group to
-    // improve quality of data.
-    const FieldTrial::Probability dev_prerender_enabled_probability = 333;
-    const FieldTrial::Probability dev_control_probability = 333;
-    const FieldTrial::Probability dev_experiment_5min_ttl_probability = 167;
-    const FieldTrial::Probability dev_experiment_no_use_probability = 167;
-    COMPILE_ASSERT(dev_prerender_enabled_probability + dev_control_probability +
-                   dev_experiment_5min_ttl_probability +
-                   dev_experiment_no_use_probability == divisor,
-                   dev_experiment_probabilities_must_equal_divisor);
-
-    prerender_enabled_probability = dev_prerender_enabled_probability;
-    control_probability = dev_experiment_5min_ttl_probability;
-    experiment_5min_ttl_probability = dev_control_probability;
-    experiment_no_use_probability = dev_experiment_no_use_probability;
+    exp1_probability = 490;
+    exp1_5min_ttl_probability = 5;
+    control1_probability = 5;
+    no_use1_probability = 0;
+    exp2_probability = 490;
+    exp2_5min_ttl_probability = 5;
+    control2_probability = 5;
+    no_use2_probability = 0;
   }
+  CHECK_EQ(divisor, exp1_probability + exp1_5min_ttl_probability +
+           control1_probability + no_use1_probability + exp2_probability +
+           exp2_5min_ttl_probability + control2_probability +
+           no_use2_probability);
+  int experiment_1_group = -1;
+  scoped_refptr<base::FieldTrial> trial(
+      base::FieldTrialList::FactoryGetFieldTrial(
+          "Prerender", divisor, "ContentPrefetchPrerender1",
+          2013, 6, 30, &experiment_1_group));
 
-  int prerender_enabled_group = -1;
-  scoped_refptr<FieldTrial> trial(
-      FieldTrialList::FactoryGetFieldTrial(
-          "Prerender", divisor, "PrerenderEnabled",
-          2013, 6, 30, &prerender_enabled_group));
-  const int control_group =
-      trial->AppendGroup("PrerenderControl",
-                         control_probability);
-  const int experiment_5_min_TTL_group =
-      trial->AppendGroup("Prerender5minTTL",
-                         experiment_5min_ttl_probability);
-  const int experiment_no_use_group =
-      trial->AppendGroup("PrerenderNoUse",
-                         experiment_no_use_probability);
-
+  const int experiment_15_min_TTL_group =
+      trial->AppendGroup("ContentPrefetchPrerenderExp5minTTL1",
+                         exp1_5min_ttl_probability);
+  const int control_1_group =
+      trial->AppendGroup("ContentPrefetchPrerenderControl1",
+                         control1_probability);
+  const int no_use_1_group =
+      trial->AppendGroup("ContentPrefetchPrerenderNoUse1",
+                         no_use1_probability);
+  const int experiment_2_group =
+      trial->AppendGroup("ContentPrefetchPrerender2",
+                         exp2_probability);
+  const int experiment_25_min_TTL_group =
+      trial->AppendGroup("ContentPrefetchPrerenderExp5minTTL2",
+                         exp2_5min_ttl_probability);
+  const int control_2_group =
+      trial->AppendGroup("ContentPrefetchPrerenderControl2",
+                         control2_probability);
+  const int no_use_2_group =
+      trial->AppendGroup("ContentPrefetchPrerenderNoUse2",
+                         no_use2_probability);
   const int trial_group = trial->group();
-  if (trial_group == prerender_enabled_group) {
+  if (trial_group == experiment_1_group ||
+      trial_group == experiment_2_group) {
     PrerenderManager::SetMode(
         PrerenderManager::PRERENDER_MODE_EXPERIMENT_PRERENDER_GROUP);
-  } else if (trial_group == control_group) {
+  } else if (trial_group == experiment_15_min_TTL_group ||
+             trial_group == experiment_25_min_TTL_group) {
     PrerenderManager::SetMode(
-        PrerenderManager::PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP);
-  } else if (trial_group == experiment_5_min_TTL_group) {
-    PrerenderManager::SetMode(
         PrerenderManager::PRERENDER_MODE_EXPERIMENT_5MIN_TTL_GROUP);
-  } else if (trial_group == experiment_no_use_group) {
+  } else if (trial_group == control_1_group ||
+             trial_group == control_2_group) {
     PrerenderManager::SetMode(
+        PrerenderManager::PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP);
+  } else if (trial_group == no_use_1_group ||
+             trial_group == no_use_2_group) {
+    PrerenderManager::SetMode(
         PrerenderManager::PRERENDER_MODE_EXPERIMENT_NO_USE_GROUP);
   } else {
     NOTREACHED();
@@ -194,16 +192,16 @@
 
 void ConfigureOmniboxPrerender() {
   // Field trial to see if we're enabled.
-  const FieldTrial::Probability kDivisor = 100;
+  const base::FieldTrial::Probability kDivisor = 100;
 
-  FieldTrial::Probability kDisabledProbability = 10;
+  base::FieldTrial::Probability kDisabledProbability = 10;
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
   if (channel == chrome::VersionInfo::CHANNEL_STABLE ||
       channel == chrome::VersionInfo::CHANNEL_BETA) {
     kDisabledProbability = 1;
   }
-  scoped_refptr<FieldTrial> omnibox_prerender_trial(
-      FieldTrialList::FactoryGetFieldTrial(
+  scoped_refptr<base::FieldTrial> omnibox_prerender_trial(
+      base::FieldTrialList::FactoryGetFieldTrial(
           kOmniboxTrialName, kDivisor, "OmniboxPrerenderEnabled",
           2012, 12, 30, &g_omnibox_trial_default_group_number));
   omnibox_prerender_trial->AppendGroup("OmniboxPrerenderDisabled",
@@ -233,23 +231,23 @@
     DCHECK(switch_value == switches::kPrerenderFromOmniboxSwitchValueAuto);
   }
 
-  const int group = FieldTrialList::FindValue(kOmniboxTrialName);
-  return group == FieldTrial::kNotFinalized ||
+  const int group = base::FieldTrialList::FindValue(kOmniboxTrialName);
+  return group == base::FieldTrial::kNotFinalized ||
          group == g_omnibox_trial_default_group_number;
 }
 
 void ConfigureSpeculativePrefetching() {
   // Field trial to see if we're enabled.
-  const FieldTrial::Probability kDivisor = 100;
+  const base::FieldTrial::Probability kDivisor = 100;
 
-  FieldTrial::Probability kDisabledProbability = 99;
+  base::FieldTrial::Probability kDisabledProbability = 99;
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
   if (channel == chrome::VersionInfo::CHANNEL_STABLE ||
       channel == chrome::VersionInfo::CHANNEL_BETA) {
     kDisabledProbability = 100;
   }
-  scoped_refptr<FieldTrial> speculative_prefetching_learning_trial(
-      FieldTrialList::FactoryGetFieldTrial(
+  scoped_refptr<base::FieldTrial> speculative_prefetching_learning_trial(
+      base::FieldTrialList::FactoryGetFieldTrial(
           kSpeculativePrefetchingLearningTrialName,
           kDivisor,
           "SpeculativePrefetchingLearningEnabled",
@@ -275,7 +273,7 @@
       return true;
   }
 
-  const int group = FieldTrialList::FindValue(
+  const int group = base::FieldTrialList::FindValue(
       kSpeculativePrefetchingLearningTrialName);
   return group == g_speculative_prefetching_learning_default_group_number;
 }