gn: simplify generated extensions API template.

extensions/generated_extensions_api.gni

 # 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.
 
 # Defines a static library corresponding to the output of schema compiler tools
 # over a set of extensions API schemas (IDL or JSON format.) The library target
 # has implicit hard dependencies on all schema files listed by the invoker and
 # is itself a hard dependency.
 #
 # Invocations of this template may use the following variables:
@@ skipping 52 matching lines @@
     "$compiler_root/compiler.py",
     "$compiler_root/cpp_generator.py",
     "$compiler_root/cpp_type_generator.py",
     "$compiler_root/cpp_util.py",
     "$compiler_root/h_generator.py",
     "$compiler_root/idl_schema.py",
     "$compiler_root/model.py",
     "$compiler_root/util_cc_helper.py",
   ]
 
-  # This list mirrors the outputs that will be generated by the following
-  # action_foreach. It's used by the static_library target.
-  compiled_schema_outputs = process_file_template(
-    schemas,
-    [ "$target_gen_dir/{{source_name_part}}.cc",
-      "$target_gen_dir/{{source_name_part}}.h",
-    ])
-
   schema_generator_name = target_name + "_schema_generator"
   action_foreach(schema_generator_name) {
     script = compiler_script
-    hard_dep = true
     source_prereqs = compiler_sources
     sources = schemas
     outputs = [
       "$target_gen_dir/{{source_name_part}}.cc",
       "$target_gen_dir/{{source_name_part}}.h",
     ]
     args = [
       "{{source}}",
       "--root=" + rebase_path("//", root_build_dir),
       "--destdir=" + rebase_path(root_gen_dir, root_build_dir),
       "--namespace=$root_namespace",
       "--generator=cpp" ]
     visibility = target_visibility
   }
 
   bundle_generator_name = target_name + "_bundle_generator"
-  bundle_outputs = [
-    "$target_gen_dir/generated_api.cc",
-    "$target_gen_dir/generated_api.h",
-    "$target_gen_dir/generated_schemas.cc",
-    "$target_gen_dir/generated_schemas.h",
-  ]
   action(bundle_generator_name) {
     script = compiler_script
-    hard_dep = true
     source_prereqs = compiler_sources + schemas + uncompiled_schemas
-    outputs = bundle_outputs
+    outputs = [
+      "$target_gen_dir/generated_api.cc",
+      "$target_gen_dir/generated_api.h",
+      "$target_gen_dir/generated_schemas.cc",
+      "$target_gen_dir/generated_schemas.h",
+    ]
     args = [
       "--root=" + rebase_path("//", root_build_dir),
       "--destdir=" + rebase_path(root_gen_dir, root_build_dir),
       "--namespace=$root_namespace",
       "--generator=cpp-bundle",
       "--impl-dir=" + rebase_path(impl_dir, "//"),
     ] +
       rebase_path(schemas, root_build_dir) +
       rebase_path(uncompiled_schemas, root_build_dir)
   }
 
   source_set(target_name) {
-    hard_dep = true
-    sources = compiled_schema_outputs + bundle_outputs
+    sources =
+      get_target_outputs(":$schema_generator_name") +
+      get_target_outputs(":$bundle_generator_name")
+
     deps = [
       ":$schema_generator_name",
       ":$bundle_generator_name",
       "//tools/json_schema_compiler:generated_api_util",
     ]
 
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
     direct_dependent_configs = [ ":$generated_config_name" ]
 
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
     if (defined(invoker.output_name)) {
       output_name = invoker.output_name
     }
   }
 }