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 8883601c4890328c729211a6112a61875a3d1fa0..58a4df26736c58cd1fbcffb8af30c0c81c958ebe 100644
--- a/testing/buildbot/chromium.mac.json
+++ b/testing/buildbot/chromium.mac.json
@@ -190,6 +190,12 @@
         "test": "message_center_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "midi_unittests"
+      },
+      {
         "test": "mojo_common_unittests"
       },
       {
@@ -389,6 +395,12 @@
         "test": "message_center_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "midi_unittests"
+      },
+      {
         "test": "mojo_common_unittests"
       },
       {
@@ -588,6 +600,12 @@
         "test": "message_center_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "midi_unittests"
+      },
+      {
         "test": "mojo_common_unittests"
       },
       {
@@ -788,6 +806,12 @@
         "test": "message_center_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "midi_unittests"
+      },
+      {
         "test": "mojo_common_unittests"
       },
       {