Update full-form autofill config to always query the field trial state.

components/autofill/ios/browser/autofill_field_trial_ios.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/autofill/ios/browser/autofill_field_trial_ios.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "components/autofill/core/common/autofill_switches.h"
 
 namespace autofill {
 
 // The full-form Autofill field trial name.
 const char kFullFormFieldTrialName[] = "FullFormAutofill";
 
 // static
 bool AutofillFieldTrialIOS::IsFullFormAutofillEnabled() {
+  // Query the field trial state first to ensure that UMA reports the correct
+  // group.
+  std::string field_trial_state =
+      base::FieldTrialList::FindFullName(kFullFormFieldTrialName);
+
   const base::CommandLine* command_line =
       base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(autofill::switches::kDisableFullFormAutofillIOS))
     return false;
   if (command_line->HasSwitch(autofill::switches::kEnableFullFormAutofillIOS))
     return true;
 
-  std::string field_trial_state =
-      base::FieldTrialList::FindFullName(kFullFormFieldTrialName);
   return !field_trial_state.empty() && field_trial_state != "Disabled";
 }
 
 }  // namespace autofill