V8 Buildbot: Pass isolate hashes from builder to tester.

scripts/slave/recipes/v8.py

Index: scripts/slave/recipes/v8.py
diff --git a/scripts/slave/recipes/v8.py b/scripts/slave/recipes/v8.py
index 917aefe208c498e49dfe5a7251f7e5217f3fbb38..a349cd7426ce033553b4d5eed961091e61f84781 100644
--- a/scripts/slave/recipes/v8.py
+++ b/scripts/slave/recipes/v8.py
@@ -104,6 +104,11 @@ def GenTests(api):
 
       if bot_config.get('parent_buildername'):
         test += api.properties(parent_got_revision='54321')
+        # Add isolated-tests property from parent builder.
+        parent = master_config['builders'][bot_config['parent_buildername']]
+        isolated_tests = parent['testing'].get('isolated_tests')
+        if isolated_tests:
+          test += api.properties(isolated_tests=isolated_tests)
 
       if mastername.startswith('tryserver'):
         test += (api.properties(