Create isolate files for nonparallel tests.

Adds missing Android things for webrtc_nonparallel_tests.

BUG=chromium:445880
R=kjellander@webrtc.org

Review URL: https://codereview.webrtc.org/1419023003 .

Cr-Original-Commit-Position: refs/heads/master@{#10451}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 4f4f756f6ff50d4142990c15fc656713d452c22b
diff --git a/webrtc_tests.gypi b/webrtc_tests.gypi
index 547b99b..811bbd7 100644
--- a/webrtc_tests.gypi
+++ b/webrtc_tests.gypi
@@ -347,6 +347,19 @@
           ],
         },
         {
+          'target_name': 'webrtc_nonparallel_tests_run',
+          'type': 'none',
+          'dependencies': [
+            'webrtc_nonparallel_tests',
+          ],
+          'includes': [
+            'build/isolate.gypi',
+          ],
+          'sources': [
+            'webrtc_nonparallel_tests.isolate',
+          ],
+        },
+        {
           'target_name': 'webrtc_perf_tests_run',
           'type': 'none',
           'dependencies': [