Allow a single trybot to mirror multiple waterfall bots.

scripts/slave/recipes/findit/chromium/test.py

Index: scripts/slave/recipes/findit/chromium/test.py
diff --git a/scripts/slave/recipes/findit/chromium/test.py b/scripts/slave/recipes/findit/chromium/test.py
index dd17484148bd7e75a50019f46c5a4a6be087e6f2..5e500e95d494238fa0796c5c0d4fcd4d6581987d 100644
--- a/scripts/slave/recipes/findit/chromium/test.py
+++ b/scripts/slave/recipes/findit/chromium/test.py
@@ -64,8 +64,8 @@ def _compile_and_test_at_revision(api, target_mastername, target_buildername,
     # Checkout code at the given revision to recompile.
     bot_update_step, bot_db = \
         api.chromium_tests.prepare_checkout(
-            target_mastername,
-            target_buildername,
+            api.chromium_tests.create_bot_desc(
+                target_mastername, target_buildername),
             root_solution_revision=revision)
 
     # Figure out which test steps to run.
@@ -144,10 +144,12 @@ def RunSteps(api, target_mastername, target_testername,
       target_mastername).get('builders', {}).get(target_testername)
   target_buildername = (tester_config.get('parent_buildername') or
                         target_testername)
+  bot_desc = api.chromium_tests.create_bot_desc(
+      target_mastername, target_buildername)
 
   # Configure to match the compile config on the builder.
   api.chromium_tests.configure_build(
-      target_mastername, target_buildername, override_bot_type='builder_tester')
+      bot_desc, override_bot_type='builder_tester')
 
   # Configure to match the test config on the tester, as builders don't have the
   # settings for swarming tests.
@@ -159,7 +161,7 @@ def RunSteps(api, target_mastername, target_testername,
 
   # Sync to bad revision, and retrieve revisions in the regression range.
   api.chromium_tests.prepare_checkout(
-      target_mastername, target_buildername,
+      bot_desc,
       root_solution_revision=bad_revision)
   revisions_to_check = api.findit.revisions_between(good_revision, bad_revision)