Initial implementation of WebUI generator (WUG) toolkit.

components/wug/generator/wug.gni

Index: components/wug/generator/wug.gni
diff --git a/components/wug/generator/wug.gni b/components/wug/generator/wug.gni
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+# 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.
+
+# Generates native and HTML/JS supporting code for Web UI element from element's
+# declaration JSON file.
+#
+# Parameters:
+#
+#   source (required)
+#      declaration file.
+#
+# NOTE: target's name should be deduced from declaration file full path
+# (relative to 'src'), by replacing every nonalphanumeric character with '_',
+# e.g. for declaration file with full path 'full/path/to/file.json' target name
+# should be 'full_path_to_file_json'. This is needed to properly handle
+# dependencies between declaration files and their imports.
+#
+# Example:
+# wug("full_path_to_file_json") {
+#   source = "file.json"
+# }
+
+template("wug") {
+  declaration_path = invoker.source
+  generator_dir = "//components/wug/generator"
+  generator_path = "$generator_dir/gen_sources.py"
+  src_root = rebase_path("//", root_build_dir)
+
+  helper_path = "$generator_dir/build_helper.py"
+  source_set_name = "${target_name}"
+  action_name = source_set_name + "_gen"
+  config_name = source_set_name + "_config"
+  out_dir = "$root_gen_dir/wug"
+
+  helper_args = [
+    rebase_path(declaration_path, root_build_dir),
+    "--destination",
+    out_dir,
+    "--root",
+    src_root,
+    "--gn",
+    "--output",
+  ]
+
+  expected_source_set_name =
+      exec_script(helper_path, helper_args + [ "target_name" ], "trim string")
+  assert(source_set_name == expected_source_set_name,
+         "Wrong target name. " + "Expected '" + expected_source_set_name +
+             "', got '" + source_set_name + "'.")
+
+  action(action_name) {
+    script = generator_path
+    sources = [
+      "$generator_dir/declaration.py",
+      "$generator_dir/html_view.py",
+      "$generator_dir/util.py",
+      "$generator_dir/view_model.py",
+      "$generator_dir/web_ui_view.py",
+    ]
+
+    inputs = [
+      declaration_path,
+    ]
+    inputs +=
+        exec_script(helper_path, helper_args + [ "imports" ], "list lines")
+    outputs =
+        exec_script(helper_path, helper_args + [ "list_outputs" ], "list lines")
+    args = [
+      rebase_path(declaration_path, root_build_dir),
+      "--root",
+      src_root,
+      "--destination",
+      out_dir,
+    ]
+  }
+
+  config(config_name) {
+    include_dirs = [ out_dir ]
+  }
+
+  source_set(source_set_name) {
+    sources = get_target_outputs(":$action_name")
+    deps = [
+      "//base",
+      "//components/strings",
+      "//components/wug",
+      "//skia",
+    ]
+    deps += exec_script(helper_path,
+                        helper_args + [ "import_dependencies" ],
+                        "list lines")
+    public_configs = [ ":" + config_name ]
+  }
+}