[android] Generate strings.xml for android_webview.

build/java_strings_grd.gypi

+# 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.
+
+# This file is meant to be included into a target to provide a rule
+# to generate localized strings.xml from a grd file.
+#
+# To use this, create a gyp target with the following form:
+# {
+#   'target_name': 'my-package_strings_grd',
+#   'type': 'none',
+#   'variables': {
+#     'grd_file': 'path/to/grd/file',
+#   },
+#   'includes': ['path/to/this/gypi/file'],
+# }
+#
+# Required variables:
+#  grd_file - The path to the grd file to use.
+{
+  'dependencies': [
+    '<(DEPTH)/build/android/setup.gyp:build_output_dirs'
+  ],
+  'variables': {
+    'intermediate_dir': '<(PRODUCT_DIR)/<(_target_name)',
+    'res_grit_dir': '<(intermediate_dir)/res_grit',
+    'grit_grd_file': '<(grd_file)',
+    'resource_input_paths': [
+      '<!@pymod_do_main(grit_info <@(grit_defines) --outputs "<(res_grit_dir)" <(grd_file))'
+    ],
+  },
+  'all_dependent_settings': {
+    'variables': {
+      'additional_res_dirs': ['<@(res_grit_dir)'],
+      'dependencies_res_input_dirs': ['<@(res_grit_dir)'],

[cjhopman, 2014/05/08 19:06:42]

I believe you also want:

  'dependencies_res_files': ['<(resource_input_paths)']

Dependencies add this list to the inputs to their resource processing (so adding
your inputs here will cause that step in dependencies to be run when one of your
inputs changes). Afaict, java_apk doesn't use this variable but it probably
should (I cannot tell if it gets this triggering from somewhere else or not).

I would just try to confirm that building then changing one of your inputs
properly triggers rebuilding of dependents.

[mkosiba (inactive), 2014/05/09 09:17:35]

Done.
I confirmed that touching the ui/android .grd file causes the process_resources,
javac, etc.. actions for ui_java to run.

+    },
+  },
+  'actions': [
+    {
+      'action_name': 'generate_localized_strings_xml',
+      'variables': {
+        'grit_additional_defines': ['-E', 'ANDROID_JAVA_TAGGED_ONLY=false'],
+        'grit_out_dir': '<(res_grit_dir)',
+        # resource_ids is unneeded since we don't generate .h headers.
+        'grit_resource_ids': '',
+      },
+      'includes': ['../build/grit_action.gypi'],
+    },
+  ],
+}