Move Field Trial Utils from chrome/common/variations to components/variations/field_trial_util

components/variations/BUILD.gn

Index: components/variations/BUILD.gn
diff --git a/components/variations/BUILD.gn b/components/variations/BUILD.gn
index f4e62354bf980b05a6d1eb58a97812d5437af0cf..ffc56daa1034755a62a2297d86aed587413778a6 100644
--- a/components/variations/BUILD.gn
+++ b/components/variations/BUILD.gn
@@ -6,6 +6,34 @@ if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
+action("fieldtrial_testing_config_action") {
+  visibility = [ ":variations" ]
+  script = "//tools/variations/fieldtrial_to_struct.py"
+
+  source = "//testing/variations/fieldtrial_testing_config.json"
+  inputs = [
+    "//tools/json_to_struct/element_generator.py",
+    "//tools/json_to_struct/json_to_struct.py",
+    "//tools/json_to_struct/struct_generator.py",
+    source,
+  ]
+  out_name = "fieldtrial_testing_config"
+  outputs = [
+    "$target_gen_dir/$out_name.cc",
+    "$target_gen_dir/$out_name.h",
+  ]
+
+  args = [
+    rebase_path(source, root_build_dir),
+    "--destbase=" + rebase_path(target_gen_dir, root_build_dir),
+    "--namespace=variations",
+    "--schema=" +
+        rebase_path("fieldtrial_testing_config_schema.json", root_build_dir),
+    "--platform=" + current_os,
+    "--output=$out_name",
+  ]
+}
+
 static_library("variations") {
   sources = [
     "active_field_trials.cc",
@@ -22,6 +50,8 @@ static_library("variations") {
     "entropy_provider.h",
     "experiment_labels.cc",
     "experiment_labels.h",
+    "fieldtrial_util.cc",
+    "fieldtrial_util.h",
     "metrics_util.cc",
     "metrics_util.h",
     "pref_names.cc",
@@ -58,6 +88,8 @@ static_library("variations") {
     "variations_util.h",
   ]
 
+  sources += get_target_outputs(":fieldtrial_testing_config_action")
+
   if (is_android || is_ios) {
     sources += [
       "variations_request_scheduler_mobile.cc",
@@ -66,11 +98,13 @@ static_library("variations") {
   }
 
   deps = [
+    ":fieldtrial_testing_config_action",
     "proto",
     "//base",
     "//components/crash/core/common",
     "//components/prefs",
     "//crypto",
+    "//net",
     "//third_party/mt19937ar",
     "//third_party/protobuf:protobuf_lite",
     "//third_party/zlib:compression_utils",
@@ -98,6 +132,7 @@ source_set("unit_tests") {
     "caching_permuted_entropy_provider_unittest.cc",
     "entropy_provider_unittest.cc",
     "experiment_labels_unittest.cc",
+    "fieldtrial_util_unittest.cc",
     "metrics_util_unittest.cc",
     "net/variations_http_headers_unittest.cc",
     "study_filtering_unittest.cc",