Mojo JS bindings: introduce new targets "foo_js"/"foo_js_data_deps" for mojom("foo").

mojo/public/interfaces/bindings/tests/BUILD.gn

 # Copyright 2014 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.
 
 import("../../../tools/bindings/mojom.gni")
 
-group("tests") {
+group("test_data_deps") {
   testonly = true
-  deps = [
-    ":test_interfaces",
-  ]
   data_deps = [
-    ":test_data",
-    ":test_data_list",
+    ":test_interfaces_js_data_deps",
+    ":test_associated_interfaces_js_data_deps",
+    ":validation_test_data",
+    ":validation_test_data_list",
   ]
 }
 
-copy("test_data") {
+copy("validation_test_data") {
   testonly = true
   sources = [
     "data/validation",
   ]
   outputs = [
     "$root_gen_dir/layout_test_data/{{source_root_relative_dir}}/{{source_file_part}}",
   ]
 }
 
-action_foreach("test_data_list") {
+action_foreach("validation_test_data_list") {
   testonly = true
   script = "//mojo/public/tools/bindings/gen_data_files_list.py"
   sources = [
     "data/validation",
   ]
   outputs = [
     "$root_gen_dir/layout_test_data/{{source_root_relative_dir}}/{{source_file_part}}_index.txt",
   ]
   args = [
     "-d",
@@ skipping 205 matching lines @@
   ]
 }
 
 mojom("echo") {
   testonly = true
   sources = [
     "echo.mojom",
     "echo_import/echo_import.mojom",
   ]
 }