Merge all Field Trial Testing Configuration Together

chrome/common/variations/BUILD.gn

 # 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.
 
 action("fieldtrial_testing_config_action") {
   visibility = [ ":fieldtrial_testing_config" ]
   script = "//tools/variations/fieldtrial_to_struct.py"
 
-  if (is_win) {
-    source = "//testing/variations/fieldtrial_testing_config_win.json"
-  }
-  if (is_mac) {
-    source = "//testing/variations/fieldtrial_testing_config_mac.json"
-  }
-  if (is_linux) {
-    source = "//testing/variations/fieldtrial_testing_config_linux.json"
-  }
-  if (is_chromeos) {
-    source = "//testing/variations/fieldtrial_testing_config_chromeos.json"
-  }
-  if (is_android) {
-    source = "//testing/variations/fieldtrial_testing_config_android.json"
-  }
-  if (is_ios) {
-    source = "//testing/variations/fieldtrial_testing_config_ios.json"
-  }
-
+  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=chrome_variations",
     "--schema=" +
         rebase_path("fieldtrial_testing_config_schema.json", root_build_dir),
+    "--platform=" + current_os,
     "--output=$out_name",
   ]
 }
 
 source_set("fieldtrial_testing_config") {
   sources = get_target_outputs(":fieldtrial_testing_config_action")
   deps = [
     ":fieldtrial_testing_config_action",
   ]
 }