Fix compile flake in gyp builds inside Blink.

third_party/WebKit/Source/web/web.gyp

 #
 # Copyright (C) 2011 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #         * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 154 matching lines @@
                 ['OS=="android"', {
                     'sources/': [
                         ['include', '^linux/WebFontRendering\\.cpp$'],
                     ],
                 }],
             ],
         },
         {
             # GN version: //third_party/WebKit/Source/web:test_support
             'target_name': 'blink_web_test_support',
+            # Because of transitive dependency on make_platform_generated.
+            'hard_dependency': 1,
             'type': 'static_library',
             'dependencies': [
                 '../config.gyp:config',
                 '../core/core.gyp:webcore_testing',
                 '../modules/modules.gyp:modules_testing',
                 '../wtf/wtf.gyp:wtf',
                 '<(DEPTH)/skia/skia.gyp:skia',
                 '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
             ],
             'include_dirs': [
@@ skipping 44 matching lines @@
                     'dependencies': ['<(DEPTH)/third_party/mesa/mesa.gyp:osmesa'],
                     'copies': [{
                         'destination': '<(PRODUCT_DIR)/DumpRenderTree.app/Contents/MacOS/',
                         'files': ['<(PRODUCT_DIR)/osmesa.so'],
                     }],
                 },
             ],
         }],
     ], # conditions
 }