Restore default-to-zero for subsequence caching record time metric.

tools/perf/measurements/rasterize_and_record_micro.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.
 
 import time
 
 from telemetry.core import exceptions
 from telemetry.page import legacy_page_test
 from telemetry.value import scalar
 
@@ skipping 64 matching lines @@
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'viewport_picture_size', 'bytes',
         picture_memory_usage))
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'record_time', 'ms', record_time))
 
     record_time_painting_disabled = data['record_time_painting_disabled_ms']
     record_time_caching_disabled = data['record_time_caching_disabled_ms']
     record_time_construction_disabled = \
         data['record_time_construction_disabled_ms']
+    # TODO(wangxianzhu): Remove this workaround when reference builds get past
+    # r367465.
     record_time_subsequence_caching_disabled = \
-        data['record_time_subsequence_caching_disabled_ms']
+        data.get('record_time_subsequence_caching_disabled_ms', 0)
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'record_time_painting_disabled', 'ms',
         record_time_painting_disabled))
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'record_time_caching_disabled', 'ms',
         record_time_caching_disabled))
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'record_time_construction_disabled', 'ms',
         record_time_construction_disabled))
     results.AddValue(scalar.ScalarValue(
@@ skipping 29 matching lines @@
           results.current_page, 'total_layers', 'count', total_layers))
       results.AddValue(scalar.ScalarValue(
           results.current_page, 'total_picture_layers', 'count',
           total_picture_layers))
       results.AddValue(scalar.ScalarValue(
           results.current_page, 'total_picture_layers_with_no_content', 'count',
           total_picture_layers_with_no_content))
       results.AddValue(scalar.ScalarValue(
           results.current_page, 'total_picture_layers_off_screen', 'count',
           total_picture_layers_off_screen))