[PPAPI] Add media stream video track example

ppapi/ppapi_tests.gypi

Index: ppapi/ppapi_tests.gypi
diff --git a/ppapi/ppapi_tests.gypi b/ppapi/ppapi_tests.gypi
index f51e31ae687064053636d77396761dd95a90ea8a..eab83e2c3cf5b8076aa2af6a9fc8e96e86fd4fa9 100644
--- a/ppapi/ppapi_tests.gypi
+++ b/ppapi/ppapi_tests.gypi
@@ -523,5 +523,15 @@
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
+    {
+      'target_name': 'ppapi_example_media_stream_video',
+      'dependencies': [
+        'ppapi_example_skeleton',
+        'ppapi.gyp:ppapi_cpp',
+      ],
+      'sources': [
+        'examples/media_stream_video/media_stream_video.cc',
+      ],
+    },
   ],
 }