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

testing/buildbot/chromium.mac.json

Index: testing/buildbot/chromium.mac.json
diff --git a/testing/buildbot/chromium.mac.json b/testing/buildbot/chromium.mac.json
index 2907a386d856b9c9b3b77b102834a2abae8f4102..5c0ba9e264269e68a7d4764c4aa2f06dda821308 100644
--- a/testing/buildbot/chromium.mac.json
+++ b/testing/buildbot/chromium.mac.json
@@ -140,6 +140,12 @@
         "test": "message_center_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "midi_unittests"
+      },
+      {
         "test": "mojo_common_unittests"
       },
       {
@@ -339,6 +345,12 @@
         "test": "message_center_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "midi_unittests"
+      },
+      {
         "test": "mojo_common_unittests"
       },
       {
@@ -538,6 +550,12 @@
         "test": "message_center_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "midi_unittests"
+      },
+      {
         "test": "mojo_common_unittests"
       },
       {
@@ -738,6 +756,12 @@
         "test": "message_center_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "midi_unittests"
+      },
+      {
         "test": "mojo_common_unittests"
       },
       {