Use Study and Experiment Terminology on the C++ Side For Fieldtrials

tools/variations/fieldtrial_to_struct_unittest.py

Index: tools/variations/fieldtrial_to_struct_unittest.py
diff --git a/tools/variations/fieldtrial_to_struct_unittest.py b/tools/variations/fieldtrial_to_struct_unittest.py
index 1c0c3f138f6659311473457f9f23e094647afa1c..999b0be4b0dfe20bbfb83cce2876142014c2b3af 100644
--- a/tools/variations/fieldtrial_to_struct_unittest.py
+++ b/tools/variations/fieldtrial_to_struct_unittest.py
@@ -48,10 +48,10 @@ class FieldTrialToStruct(unittest.TestCase):
     expected = {
       'elements': {
         'kFieldTrialConfig': {
-          'trials': [
+          'studies': [
             {
               'name': 'Trial1',
-              'groups': [
+              'experiments': [
                 {
                   'name': 'Group1',
                   'params': [
@@ -74,7 +74,7 @@ class FieldTrialToStruct(unittest.TestCase):
             },
             {
               'name': 'Trial2',
-              'groups': [{'name': 'OtherGroup'}]
+              'experiments': [{'name': 'OtherGroup'}]
             },
           ]
         }
@@ -131,10 +131,10 @@ class FieldTrialToStruct(unittest.TestCase):
     expected = {
       'elements': {
         'kFieldTrialConfig': {
-          'trials': [
+          'studies': [
             {
               'name': 'Trial1',
-              'groups': [
+              'experiments': [
                 {
                   'name': 'Group1',
                   'params': [
@@ -171,10 +171,10 @@ class FieldTrialToStruct(unittest.TestCase):
     expected = {
       'elements': {
         'kFieldTrialConfig': {
-          'trials': [
+          'studies': [
             {
               'name': 'Trial2',
-              'groups': [
+              'experiments': [
                 {
                   'name': 'OtherGroup',
                 },