Send all field trials from the browser.

base/metrics/field_trial.cc

Index: base/metrics/field_trial.cc
diff --git a/base/metrics/field_trial.cc b/base/metrics/field_trial.cc
index 7efca7a3ef53cdaa8093b880b44d7e469bebc27d..b7812d935d9fade9aedc40fbdc210862ae98aca0 100644
--- a/base/metrics/field_trial.cc
+++ b/base/metrics/field_trial.cc
@@ -223,6 +223,15 @@ bool FieldTrial::GetActiveGroup(ActiveGroup* active_group) const {
   return true;
 }
 
+bool FieldTrial::GetAllGroup(AllGroup* all_group) const {
+  if (!enable_field_trial_)
+    return false;
+  all_group->trial_name = trial_name_;
+  all_group->group_name = group_name_;
+  all_group->activated = group_reported_;
+  return true;
+}
+
 //------------------------------------------------------------------------------
 // FieldTrialList methods and members.
 
@@ -387,6 +396,25 @@ void FieldTrialList::StatesToString(std::string* output) {
 }
 
 // static
+void FieldTrialList::AllStatesToString(std::string* output) {
+  FieldTrial::AllGroups all_groups;
+  GetAllFieldTrialGroups(&all_groups);
+  for (FieldTrial::AllGroups::const_iterator it = all_groups.begin();
+       it != all_groups.end(); ++it) {

[Alexei Svitkine (slow), 2014/11/05 16:17:13]

Nit: We now support C++11, so this can be:

for (const FieldTrial::AllGroup& group : all_groups) {

Same for your loop in GetAllFieldTrialGroups().

[Georges Khalil, 2014/11/05 20:00:12]

Done.

+    DCHECK_EQ(std::string::npos,
+              it->trial_name.find(kPersistentStringSeparator));
+    DCHECK_EQ(std::string::npos,
+              it->group_name.find(kPersistentStringSeparator));
+    if (it->activated)
+      output->append(1, kActivationMarker);
+    output->append(it->trial_name);
+    output->append(1, kPersistentStringSeparator);
+    output->append(it->group_name);
+    output->append(1, kPersistentStringSeparator);
+  }
+}
+
+// static
 void FieldTrialList::GetActiveFieldTrialGroups(
     FieldTrial::ActiveGroups* active_groups) {
   DCHECK(active_groups->empty());
@@ -403,6 +431,22 @@ void FieldTrialList::GetActiveFieldTrialGroups(
 }
 
 // static
+void FieldTrialList::GetAllFieldTrialGroups(
+    FieldTrial::AllGroups* all_groups) {
+  DCHECK(all_groups->empty());
+  if (!global_)
+    return;
+  AutoLock auto_lock(global_->lock_);
+
+  for (RegistrationMap::iterator it = global_->registered_.begin();
+       it != global_->registered_.end(); ++it) {
+    FieldTrial::AllGroup all_group;
+    if (it->second->GetAllGroup(&all_group))
+      all_groups->push_back(all_group);
+  }
+}
+
+// static
 bool FieldTrialList::CreateTrialsFromString(
     const std::string& trials_string,
     FieldTrialActivationMode mode,