Add revocation checking field trial.

chrome/browser/browser_main.cc

Index: chrome/browser/browser_main.cc
diff --git a/chrome/browser/browser_main.cc b/chrome/browser/browser_main.cc
index 81662bbc6d0672ec33e36b01295575e6936243d2..c93481061ff5562822e14a44d0ce79b5624115db 100644
--- a/chrome/browser/browser_main.cc
+++ b/chrome/browser/browser_main.cc
@@ -502,6 +502,23 @@ void BrowserMainParts::ConnectBackupJobsFieldTrial() {
   }
 }
 
+void BrowserMainParts::RevocationCheckingDisabledFieldTrial() {
+  const base::FieldTrial::Probability kDivisor = 100;
+  base::FieldTrial::Probability probability = 50;  // 50/50 trial
+
+  // After August 30, 2011 builds, it will always be in default group.
+  scoped_refptr<base::FieldTrial> trial(
+      new base::FieldTrial(
+          "RevCheckingImpact", kDivisor, "RevChecking_control", 2011, 8, 30));

[Mike Belshe, 2011/06/08 04:50:38]

nit:  change "RevChecking_control" to "_control"?

I hope this will only be for pinned sites too, right?  Otherwise, this isn't a
strict A/B test.

[agl, 2011/06/08 18:57:12]

Have changed to "control" since none of the other users of FieldTrial in this
file prepend underscores. Please let me know if there's something that I missed.

+
+  int disabled_group = trial->AppendGroup(
+      "RevChecking_disabled_for_pinned_sites", probability);

[Mike Belshe, 2011/06/08 04:50:38]

nit:  change to "_disabled"

[agl, 2011/06/08 18:57:12]

Done (with the same remark about the leading underscore).

+
+  int trial_grp = trial->group();
+  if (trial_grp == disabled_group)
+    net::SSLConfigService::DisableRevCheckingForPinnedSites();
+}
+
 // BrowserMainParts: |MainMessageLoopStart()| and related ----------------------
 
 void BrowserMainParts::MainMessageLoopStart() {
@@ -592,6 +609,7 @@ void BrowserMainParts::SetupFieldTrials(bool metrics_recording_enabled) {
   prerender::ConfigurePrefetchAndPrerender(parsed_command_line());
   SpdyFieldTrial();
   ConnectBackupJobsFieldTrial();
+  RevocationCheckingDisabledFieldTrial();
 }
 
 // -----------------------------------------------------------------------------