Empty per_page_values shouldn't imply test success

scripts/slave/recipes/gpu/download_and_test.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This recipe is intended to control all of the GPU testers on the
 # following waterfalls:
 #   chromium.gpu
 #   chromium.gpu.fyi
 #   chromium.webkit
 #   tryserver.chromium.*
@@ skipping 66 matching lines @@
         api.test('%s_%s' % (plat, flavor_lower)) +
         props(plat, flavor) +
         api.platform.name(plat)
       )
 
   yield (
     api.test('failures_keeps_going') +
     props('linux', 'Release') +
     api.platform.name('linux') +
     api.step_data('content_gl_tests', retcode=1) +
-    api.step_data('maps_pixel_test', retcode=1)
+    api.step_data('maps_pixel_test',
+        api.test_utils.canned_telemetry_gpu_output(
+            passing=False, is_win=False, swarming=False))
+  )
+
+  yield (
+    api.test('telemetry_gpu_test_harness_failure') +
+    props('linux', 'Release') +
+    api.platform.name('linux') +
+    api.step_data('maps_pixel_test',
+        api.test_utils.canned_telemetry_gpu_output(
+            passing=False, is_win=False, swarming=False,
+            empty_per_page_values=True),
+        retcode=255)
   )
 
   win_fyi_hashes = api.gpu.dummy_win_fyi_swarm_hashes
 
   yield (
     api.test('win_release_deqp') +
     named_props('win', 'Release', 'win release dEQP tester', win_fyi_hashes) +
     api.platform.name('win')
   )
 
   linux_fyi_hashes = api.gpu.dummy_linux_fyi_swarm_hashes
 
   yield (
     api.test('linux_release_deqp') +
     named_props('linux', 'Release', 'linux release dEQP tester',
         linux_fyi_hashes) +
     api.platform.name('linux')
   )