Reland: Extract media/capture/capture_unittests from media_unittests

testing/buildbot/chromium.chromiumos.json

Index: testing/buildbot/chromium.chromiumos.json
diff --git a/testing/buildbot/chromium.chromiumos.json b/testing/buildbot/chromium.chromiumos.json
index f8cca4448858ac8b7146ea1b5c7e96a85e82a1fa..e9d49d8f55e7833111ae35850717039c85a039a4 100644
--- a/testing/buildbot/chromium.chromiumos.json
+++ b/testing/buildbot/chromium.chromiumos.json
@@ -108,6 +108,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "capture_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "chromeos_unittests"
       },
       {
@@ -418,6 +424,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "capture_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "chrome_app_unittests"
       },
       {
@@ -729,6 +741,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "capture_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "chrome_app_unittests"
       },
       {