Implement a basic PPAPI plugin for Blink layout tests.

ppapi/ppapi_tests.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       # GN version: //ppapi:ppapi_tests
       'target_name': 'ppapi_tests',
       'type': 'loadable_module',
@@ skipping 83 matching lines @@
       ],
       'conditions': [
         ['OS=="mac"', {
           'mac_bundle': 1,
           'product_name': 'power_saver_test_plugin',
           'product_extension': 'plugin',
         }],
       ],
     },
     {
+      # GN version: //ppapi:blink_test_plugin
+      'target_name': 'blink_test_plugin',
+      'type': 'loadable_module',
+      'sources': [
+        'tests/blink_test_plugin.cc',
+      ],
+      'dependencies': [
+        'ppapi.gyp:ppapi_cpp',
+        'ppapi_internal.gyp:ppapi_shared',
+      ],
+      'conditions': [
+        ['OS=="mac"', {
+          'mac_bundle': 1,
+          'product_name': 'blink_test_plugin',
+          'product_extension': 'plugin',
+        }],
+      ],
+    },
+    {
       # GN version: //ppapi/proxy:test_support
       #             //ppapi/shared_impl:test_support
       'target_name': 'ppapi_unittest_shared',
       'type': 'static_library',
       'dependencies': [
         'ppapi_proxy',
         'ppapi_shared',
         '../base/base.gyp:test_support_base',
         '../ipc/ipc.gyp:ipc',
         '../ipc/ipc.gyp:test_support_ipc',
@@ skipping 533 matching lines @@
       'sources': [
         'examples/compositor/compositor.cc',
         'examples/compositor/spinning_cube.cc',
         'examples/compositor/spinning_cube.h',
       ],
     },
     # Adding a new PPAPI example? Don't forget to update the GN build.
     # See //ppapi/examples/BUILD.gn
   ],
 }