Extract media/capture/capture_unittests from media_unittests

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 2b3ceb838df4e4bad4f5251ee8449ed0febfe2cc..0c48df41986bdfd14c1e2eb59bcff55a16d2ae2f 100644
--- a/testing/buildbot/chromium.mac.json
+++ b/testing/buildbot/chromium.mac.json
@@ -46,6 +46,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "capture_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cast_unittests"
       },
       {
@@ -373,6 +379,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "capture_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cast_unittests"
       },
       {
@@ -700,6 +712,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "capture_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cast_unittests"
       },
       {
@@ -1028,6 +1046,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "capture_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "cast_unittests"
       },
       {