Add data pipe wrappers to be used to implement serial send.

BUG=389016

Review URL: https://codereview.chromium.org/466623003

Cr-Commit-Position: refs/heads/master@{#290507}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290507 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/device/device_tests.gyp b/device/device_tests.gyp
index 118e7853..7e913e6 100644
--- a/device/device_tests.gyp
+++ b/device/device_tests.gyp
@@ -47,6 +47,7 @@
         'hid/hid_report_descriptor_unittest.cc',
         'hid/hid_service_unittest.cc',
         'hid/input_service_linux_unittest.cc',
+        'serial/data_sink_unittest.cc',
         'serial/data_source_unittest.cc',
         'serial/serial_connection_unittest.cc',
         'serial/serial_service_unittest.cc',