Adding a local predictor field trial, and a facility

to report local predictor stats based on a whitelist of
URL hashes (only placeholder dummy file for now).
R=shishir@chromium.org
Review URL: https://codereview.chromium.org/11364034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@165696 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 27 insertions, 0 deletions

diff --git a/chrome/browser/prerender/prerender_field_trial.cc b/chrome/browser/prerender/prerender_field_trial.cc
index 7938dca..15bd501 100644
--- a/chrome/browser/prerender/prerender_field_trial.cc
+++ b/chrome/browser/prerender/prerender_field_trial.cc
@@ -30,6 +30,9 @@ const char kSpeculativePrefetchingTrialName[] = "SpeculativePrefetching";
 int g_speculative_prefetching_learning_group = kint32min;
 int g_speculative_prefetching_prefetching_group = kint32min;
 
+const char kLocalPredictorTrialName[] = "PrerenderLocalPredictor";
+int g_local_predictor_default_group_number = kint32min;
+
 void SetupPrefetchFieldTrial() {
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
   if (channel == chrome::VersionInfo::CHANNEL_STABLE ||
@@ -143,6 +146,7 @@ void SetupPrerenderFieldTrial() {
 
 void ConfigureOmniboxPrerender();
 void ConfigureSpeculativePrefetching();
+void ConfigureLocalPredictor();
 
 void ConfigurePrefetchAndPrerender(const CommandLine& command_line) {
   enum PrerenderOption {
@@ -204,6 +208,7 @@ void ConfigurePrefetchAndPrerender(const CommandLine& command_line) {
 
   ConfigureOmniboxPrerender();
   ConfigureSpeculativePrefetching();
+  ConfigureLocalPredictor();
 }
 
 void ConfigureOmniboxPrerender() {
@@ -333,4 +338,26 @@ bool IsSpeculativeResourcePrefetchingEnabled(Profile* profile) {
   return group == g_speculative_prefetching_prefetching_group;
 }
 
+void ConfigureLocalPredictor() {
+  const FieldTrial::Probability kDivisor = 100;
+
+  FieldTrial::Probability kEnableProbability = 90;
+  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
+  if (channel == chrome::VersionInfo::CHANNEL_STABLE ||
+      channel == chrome::VersionInfo::CHANNEL_BETA) {
+    kEnableProbability = 1;
+  }
+  scoped_refptr<FieldTrial> local_predictor_trial(
+      FieldTrialList::FactoryGetFieldTrial(
+          kLocalPredictorTrialName, kDivisor, "Disabled",
+          2013, 12, 31, &g_local_predictor_default_group_number));
+  local_predictor_trial->AppendGroup("Enabled", kEnableProbability);
+}
+
+bool IsLocalPredictorEnabled() {
+  const int group = FieldTrialList::FindValue(kLocalPredictorTrialName);
+  return (group != FieldTrial::kNotFinalized &&
+          group != g_omnibox_trial_default_group_number);
+}
+
 }  // namespace prerender