Reland: Web MIDI: split build rules for media/midi

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 8e1fe424f7be5c46edfc77e4d7e9f37b27e98978..bf50824c428212b803b83d3e28442887abf5381d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -84,6 +84,7 @@ group("both_gn_and_gyp") {
     "//jingle:jingle_unittests",
     "//media:media_unittests",
     "//media/cast:cast_unittests",
+    "//media/midi:midi_unittests",
     "//mojo",
     "//mojo/application",
     "//mojo/common:mojo_common_unittests",
@@ -740,8 +741,9 @@ if (is_linux) {
       "//ipc:ipc_tests",  # PASSES 2/25/2015
       "//ipc/mojo:ipc_mojo_unittests",  # PASSES 2/25/2015
       "//jingle:jingle_unittests",  # PASSES 2/25/2015
-      "//media/cast:cast_unittests",  # PASSES 2/25/2015
       "//media:media_unittests",  # PASSES 3/3/2015
+      "//media/cast:cast_unittests",  # PASSES 2/25/2015
+      "//media/midi:midi_unittests",  # PASSES 4/10/2015
       "//mojo/common:mojo_common_unittests",  # PASSES 2/25/2015
       "//net:net_unittests",  # PASSES 2/25/2015
       "//ppapi:ppapi_unittests",  # PASSES 2/26/2015