Add empty dart:platform library.

runtime/vm/vm.gypi

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
     'gen_source_dir': '<(SHARED_INTERMEDIATE_DIR)',
     'libgen_in_cc_file': '../lib/libgen_in.cc',
     'builtin_in_cc_file': '../bin/builtin_in.cc',
     'async_cc_file': '<(gen_source_dir)/async_gen.cc',
     'async_patch_cc_file': '<(gen_source_dir)/async_patch_gen.cc',
     'corelib_cc_file': '<(gen_source_dir)/corelib_gen.cc',
     'corelib_patch_cc_file': '<(gen_source_dir)/corelib_patch_gen.cc',
     'collection_cc_file': '<(gen_source_dir)/collection_gen.cc',
     'collection_patch_cc_file': '<(gen_source_dir)/collection_patch_gen.cc',
     'collection_dev_cc_file': '<(gen_source_dir)/collection_dev_gen.cc',
     'collection_dev_patch_cc_file': '<(gen_source_dir)/collection_dev_patch_gen.cc',
     'convert_cc_file': '<(gen_source_dir)/convert_gen.cc',
     'convert_patch_cc_file': '<(gen_source_dir)/convert_patch_gen.cc',
     'math_cc_file': '<(gen_source_dir)/math_gen.cc',
     'math_patch_cc_file': '<(gen_source_dir)/math_patch_gen.cc',
     'mirrors_cc_file': '<(gen_source_dir)/mirrors_gen.cc',
     'mirrors_patch_cc_file': '<(gen_source_dir)/mirrors_patch_gen.cc',
     'isolate_cc_file': '<(gen_source_dir)/isolate_gen.cc',
     'isolate_patch_cc_file': '<(gen_source_dir)/isolate_patch_gen.cc',
     'json_cc_file': '<(gen_source_dir)/json_gen.cc',
+    'platform_cc_file': '<(gen_source_dir)/platform_gen.cc',
+    'platform_patch_cc_file': '<(gen_source_dir)/platform_patch_gen.cc',
     'typed_data_cc_file': '<(gen_source_dir)/typed_data_gen.cc',
     'typed_data_patch_cc_file': '<(gen_source_dir)/typed_data_patch_gen.cc',
     'utf_cc_file': '<(gen_source_dir)/utf_gen.cc',
     'snapshot_test_dat_file': '<(gen_source_dir)/snapshot_test.dat',
     'snapshot_test_in_dat_file': 'snapshot_test_in.dat',
     'snapshot_test_dart_file': 'snapshot_test.dart',
   },
   'targets': [
     {
       'target_name': 'libdart_vm',
@@ skipping 67 matching lines @@
         'generate_collection_dev_patch_cc_file#host',
         'generate_convert_cc_file#host',
         'generate_convert_patch_cc_file#host',
         'generate_math_cc_file#host',
         'generate_math_patch_cc_file#host',
         'generate_isolate_cc_file#host',
         'generate_isolate_patch_cc_file#host',
         'generate_json_cc_file#host',
         'generate_mirrors_cc_file#host',
         'generate_mirrors_patch_cc_file#host',
+        'generate_platform_cc_file#host',
         'generate_typed_data_cc_file#host',
         'generate_typed_data_patch_cc_file#host',
         'generate_utf_cc_file#host',
       ],
       'includes': [
         '../lib/async_sources.gypi',
         '../lib/collection_sources.gypi',
         '../lib/corelib_sources.gypi',
         '../lib/isolate_sources.gypi',
         '../lib/math_sources.gypi',
         '../lib/mirrors_sources.gypi',
+        '../lib/platform_sources.gypi',
         '../lib/typed_data_sources.gypi',
       ],
       'sources': [
         'bootstrap.cc',
         # Include generated source files.
         '<(async_cc_file)',
         '<(async_patch_cc_file)',
         '<(corelib_cc_file)',
         '<(corelib_patch_cc_file)',
         '<(collection_cc_file)',
         '<(collection_patch_cc_file)',
         '<(collection_dev_cc_file)',
         '<(collection_dev_patch_cc_file)',
         '<(convert_cc_file)',
         '<(convert_patch_cc_file)',
         '<(math_cc_file)',
         '<(math_patch_cc_file)',
         '<(isolate_cc_file)',
         '<(isolate_patch_cc_file)',
         '<(json_cc_file)',
         '<(mirrors_cc_file)',
         '<(mirrors_patch_cc_file)',
+        '<(platform_cc_file)',
+        '<(platform_patch_cc_file)',
         '<(typed_data_cc_file)',
         '<(typed_data_patch_cc_file)',
         '<(utf_cc_file)',
       ],
       'include_dirs': [
         '..',
       ],
     },
     {
       'target_name': 'libdart_lib',
       'type': 'static_library',
       'toolsets':['host', 'target'],
       'includes': [
         '../lib/async_sources.gypi',
         '../lib/collection_sources.gypi',
         '../lib/corelib_sources.gypi',
         '../lib/isolate_sources.gypi',
         '../lib/math_sources.gypi',
         '../lib/mirrors_sources.gypi',
+        '../lib/platform_sources.gypi',
         '../lib/typed_data_sources.gypi',
       ],
       'sources': [
         'bootstrap_nocorelib.cc',
       ],
       'include_dirs': [
         '..',
       ],
     },
     {
@@ skipping 662 matching lines @@
             '--include', 'vm/bootstrap.h',
             '--var_name', 'dart::Bootstrap::json_source_paths_',
             '--library_name', 'dart:json',
             '<@(_sources)',
           ],
           'message': 'Generating ''<(json_cc_file)'' file.'
         },
       ]
     },
     {
+      'target_name': 'generate_platform_cc_file',
+      'type': 'none',
+      'toolsets':['host'],
+      'includes': [
+        '../../sdk/lib/platform/platform_sources.gypi',
+      ],
+      'sources/': [
+        # Exclude all .[cc|h] files.
+        # This is only here for reference. Excludes happen after
+        # variable expansion, so the script has to do its own
+        # exclude processing of the sources being passed.
+        ['exclude', '\\.cc|h$'],
+      ],
+      'actions': [
+        {
+          'action_name': 'generate_platform_cc',
+          'inputs': [
+            '../tools/gen_library_src_paths.py',
+            '<(libgen_in_cc_file)',
+            '<@(_sources)',
+          ],
+          'outputs': [
+            '<(platform_cc_file)',
+          ],
+          'action': [
+            'python',
+            'tools/gen_library_src_paths.py',
+            '--output', '<(platform_cc_file)',
+            '--input_cc', '<(libgen_in_cc_file)',
+            '--include', 'vm/bootstrap.h',
+            '--var_name', 'dart::Bootstrap::platform_source_paths_',
+            '--library_name', 'dart:platform',
+            '<@(_sources)',
+          ],
+          'message': 'Generating ''<(platform_cc_file)'' file.'
+        },
+      ]
+    },
+    {
+      'target_name': 'generate_platform_patch_cc_file',
+      'type': 'none',
+      'toolsets':['host'],
+      'includes': [
+        # Load the runtime implementation sources.
+        '../lib/platform_sources.gypi',
+      ],
+      'sources/': [
+        # Exclude all .[cc|h] files.
+        # This is only here for reference. Excludes happen after
+        # variable expansion, so the script has to do its own
+        # exclude processing of the sources being passed.
+        ['exclude', '\\.cc|h$'],
+      ],
+      'actions': [
+        {
+          'action_name': 'generate_platform_patch_cc',
+          'inputs': [
+            '../tools/gen_library_src_paths.py',
+            '<(libgen_in_cc_file)',
+            '<@(_sources)',
+          ],
+          'outputs': [
+            '<(platform_patch_cc_file)',
+          ],
+          'action': [
+            'python',
+            'tools/gen_library_src_paths.py',
+            '--output', '<(platform_patch_cc_file)',
+            '--input_cc', '<(libgen_in_cc_file)',
+            '--include', 'vm/bootstrap.h',
+            '--var_name', 'dart::Bootstrap::platform_patch_paths_',
+            '--library_name', 'dart:platform',
+            '<@(_sources)',
+          ],
+          'message': 'Generating ''<(platform_patch_cc_file)'' file.'
+        },
+      ]
+    },
+    {
       'target_name': 'generate_typed_data_cc_file',
       'type': 'none',
       'toolsets':['host'],
       'includes': [
         # Load the shared library sources.
         '../../sdk/lib/typed_data/typed_data_sources.gypi',
       ],
       'sources/': [
         # Exclude all .[cc|h] files.
         # This is only here for reference. Excludes happen after
@@ skipping 122 matching lines @@
             '--include', 'INTENTIONALLY_LEFT_BLANK',
             '--var_name', 'INTENTIONALLY_LEFT_BLANK_TOO',
             '<(snapshot_test_dart_file)',
           ],
           'message': 'Generating ''<(snapshot_test_dat_file)'' file.'
         },
       ]
     },
   ]
 }