Rewrite presubmit scripts to use new EnsureCQIncludeTrybotsAreAdded.

gpu/PRESUBMIT.py

Index: gpu/PRESUBMIT.py
diff --git a/gpu/PRESUBMIT.py b/gpu/PRESUBMIT.py
index d993bd90a5c8ae70e0ee24a6c7e70215d2732239..7300f07c6b23155171ce972e22914b446343eeb8 100644
--- a/gpu/PRESUBMIT.py
+++ b/gpu/PRESUBMIT.py
@@ -8,33 +8,20 @@ See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools.
 """
 
-import re
-
 def PostUploadHook(cl, change, output_api):
   """git cl upload will call this hook after the issue is created/modified.
 
-  This hook adds extra try bots list to the CL description in order to run
-  Blink tests in addition to CQ try bots.
+  This hook modifies the CL description in order to run extra GPU
+  tests (in particular, the WebGL 2.0 conformance tests) in addition
+  to the regular CQ try bots. This test suite is too large to run
+  against all Chromium commits, but should be run against changes
+  likely to affect these tests.
   """
-  rietveld_obj = cl.RpcServer()
-  issue = cl.issue
-  description = rietveld_obj.get_description(issue)
-  if re.search(r'^CQ_INCLUDE_TRYBOTS=.*', description, re.M | re.I):
-    return []
-
-  bots = [
-    'master.tryserver.chromium.linux:linux_optional_gpu_tests_rel',
-    'master.tryserver.chromium.mac:mac_optional_gpu_tests_rel',
-    'master.tryserver.chromium.win:win_optional_gpu_tests_rel',
-  ]
-
-  results = []
-  new_description = description
-  new_description += '\nCQ_INCLUDE_TRYBOTS=%s' % ';'.join(bots)
-  results.append(output_api.PresubmitNotifyResult(
-      'Automatically added optional GPU tests to run on CQ.'))
-
-  if new_description != description:
-    rietveld_obj.update_description(issue, new_description)
-
-  return results
+  return output_api.EnsureCQIncludeTrybotsAreAdded(
+    cl,
+    [
+      'master.tryserver.chromium.linux:linux_optional_gpu_tests_rel',
+      'master.tryserver.chromium.mac:mac_optional_gpu_tests_rel',
+      'master.tryserver.chromium.win:win_optional_gpu_tests_rel',
+    ],
+    'Automatically added optional GPU tests to run on CQ.')