bindings GYP: split off scripts

Source/bindings/scripts/scripts.gyp

+# 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.
+
+# Pre-caching steps used internally by the IDL compiler
+#
+# Design doc: http://www.chromium.org/developers/design-documents/idl-build
+
+{
+  'includes': [
+    'scripts.gypi',
+    '../bindings.gypi',
+    '../templates/templates.gypi',
+  ],
+
+  'targets': [
+################################################################################
+  {
+    # A separate pre-caching step is *not required* to use lex/parse table
+    # caching in PLY, as the caches are concurrency-safe.
+    # However, pre-caching ensures that all compiler processes use the cached
+    # files (hence maximizing speed), instead of early processes building the
+    # tables themselves (as they've not yet been written when they start).
+    'target_name': 'cached_lex_yacc_tables',
+    'type': 'none',
+    'actions': [{
+      'action_name': 'cache_lex_yacc_tables',
+      'inputs': [
+        '<@(idl_lexer_parser_files)',
+      ],
+      'outputs': [
+        '<(bindings_output_dir)/lextab.py',
+        '<(bindings_output_dir)/parsetab.pickle',
+      ],
+      'action': [
+        'python',
+        'blink_idl_parser.py',
+        '<(bindings_output_dir)',
+      ],
+      'message': 'Caching PLY lex & yacc lex/parse tables',
+    }],
+  },
+################################################################################
+  {
+    # A separate pre-caching step is *required* to use bytecode caching in
+    # Jinja (which improves speed significantly), as the bytecode cache is
+    # not concurrency-safe on write; details in code_generator_v8.py.
+    'target_name': 'cached_jinja_templates',
+    'type': 'none',
+    'actions': [{
+      'action_name': 'cache_jinja_templates',
+      'inputs': [
+        '<@(jinja_module_files)',
+        'code_generator_v8.py',
+        '<@(code_generator_template_files)',
+      ],
+      'outputs': [
+        '<(bindings_output_dir)/cached_jinja_templates.stamp',  # Dummy to track dependency
+      ],
+      'action': [
+        'python',
+        'code_generator_v8.py',
+        '<(bindings_output_dir)',
+        '<(bindings_output_dir)/cached_jinja_templates.stamp',
+      ],
+      'message': 'Caching bytecode of Jinja templates',
+    }],
+  },
+################################################################################
+  ],  # targets
+}