UserAgent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Steps to reproduce the problem:
(1)sync Chromium OS source code with manifest 10798.0.0-rc2.xml from paladin folder in manifest-versions repo (https://chromium.googlesource.com/chromiumos/manifest-versions)
(2)sync Chromium to 69.0.3464.0
(3)build local image with below commands:
	1) cros_sdk --enter --chrome_root=chrome_root
	2) export CHROME_ORIGIN=LOCAL_SOURCE
	3) export BOARD=reef
	4) ./setup_board --board=$BOARD
	5) cros_workon --board=$BOARD start chromeos-chrome
	6) USE="afdo_use thinlto" ./build_packages --board=$BOARD
	7) ./build_image --board=$BOARD --noenable_rootfs_verification test
(4) run page_cycler_v2.typical_25 using local build ChromiumOS image and check the results

What is the expected behavior?
All pages are loaded successfully with metric values using local build ChromiumOS images

What went wrong?
5 pages would fail:
(1) economist
(2) allrecipes
(3) money.cnn
(4) premierleague
(5) ign
However, no failure observed if using partner ChromeOS image with the same version (i.e., 10798.0.0).

The error messages from local build ChromiumOS image are shown as:
Traceback (most recent call last):
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 123, in _RunStoryAndProcessErrorIfNeeded
    state.RunStory(results)
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 311, in RunStory
    self._current_page.Run(self)
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/telemetry/telemetry/page/__init__.py", line 100, in Run
    self.RunPageInteractions(action_runner)
  File "/home/test/chromium_telemetry_new_5/src/tools/perf/page_sets/typical_25.py", line 27, in RunPageInteractions
    'performance.timing.loadEventStart > 0')
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/telemetry/telemetry/internal/actions/action_runner.py", line 261, in WaitForJavaScriptCondition
    return self._tab.WaitForJavaScriptCondition(*args, **kwargs)
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/telemetry/telemetry/internal/browser/web_contents.py", line 239, in WaitForJavaScriptCondition
    return self._inspector_backend.WaitForJavaScriptCondition(*args, **kwargs)
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/home/test/chromium_telemetry_new_5/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py", line 302, in WaitForJavaScriptCondition
    e.message + '\n' + debug_message)
TimeoutException: Timed out while waiting 60s for IsJavaScriptExpressionTrue.

Did this work before? Yes 

Chrome version: 69.0.3464.0  Channel: n/a
OS Version: 10798.0.0
Flash Version: