Revert 73402 - Disk cache: Disable the throttling experiment.

This is intended for the beta/stable channels.

BUG=none
TEST=none
TBR=gavinp

Review URL: http://codereview.chromium.org/6286036

TBR=rvargas@google.com
Review URL: http://codereview.chromium.org/6250097

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@73405 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 12 insertions, 1 deletions

diff --git a/net/disk_cache/backend_impl.cc b/net/disk_cache/backend_impl.cc
index 593d271..0a6ad778 100644
--- a/net/disk_cache/backend_impl.cc
+++ b/net/disk_cache/backend_impl.cc
@@ -180,7 +180,14 @@ bool SetFieldTrialInfo(int size_group) {
       new base::FieldTrial("CacheSize", totalProbability, group1, 2011, 6, 30));
   trial1->AppendGroup(group1, totalProbability);
 
-  return false;
+  // After June 30, 2011 builds, it will always be in default group.
+  scoped_refptr<base::FieldTrial> trial2(
+      new base::FieldTrial(
+          "CacheThrottle", 100, "CacheThrottle_Default", 2011, 6, 30));
+  int group2a = trial2->AppendGroup("CacheThrottle_On", 10);  // 10 % in.
+  trial2->AppendGroup("CacheThrottle_Off", 10);  // 10 % control.
+
+  return trial2->group() == group2a;
 }
 
 // ------------------------------------------------------------------------
@@ -1133,6 +1140,10 @@ void BackendImpl::OnOperationCompleted(base::TimeDelta elapsed_time) {
   if (cache_type() != net::DISK_CACHE)
     return;
 
+  UMA_HISTOGRAM_TIMES(base::FieldTrial::MakeName("DiskCache.TotalIOTime",
+                                                 "CacheThrottle").data(),
+                      elapsed_time);
+
   if (!throttle_requests_)
     return;