strange: https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus6%20WebView%20Perf/builds/126/steps/media.mse_cases%20on%20Android

"""
media.mse_cases on Android
Bot id: 'build113-b1--device7'
Run on OS: 'Android'
swarming pending 30s
Total tests: 12
* Passed: 12 (12 expected, 0 unexpected)
* Skipped: 0 (0 expected, 0 unexpected)
* Failed: 0 (0 expected, 0 unexpected)
* Flaky: 0 (0 expected, 0 unexpected)
"""

Seeing a lot of this:

Locals:
  _            : None
  args         : ['/b/swarming/w/ir/third_party/catapult/third_party/vinn/third_party/v8/linux/x86_64/d8', '/b/swarming/w/itbPjStW/tmptFiZzf/_tmp_boostrap.js', '--js_arguments', '/b/swarming/w/ir/third_party/catapult/third_party/vinn/third_party/v8/linux/x86_64/d8', '/b/swarming/w/itbPjStW/tmpwFj8Uo']
  full_js_args : ['/b/swarming/w/ir/third_party/catapult/third_party/vinn/third_party/v8/linux/x86_64/d8', '/b/swarming/w/itbPjStW/tmpwFj8Uo']
  js_args      : ['/b/swarming/w/itbPjStW/tmpwFj8Uo']
  js_file_path : '/b/swarming/w/itbPjStW/tmptFiZzf/_tmp_boostrap.js'
  out          : 'undefined:1: SyntaxError: Unexpected token N in JSON at position 3195\n{"label": null, "benchmarkStartMs": 1502762376181.867, "trace_rerun_options": [], "benchmark_metadata": {"rerun_options": [], "type": "telemetry_benchmark", "name": "media.mse_cases", "description": "Obtains media metrics for key media source extensions functions."}, "format_version": "0.1", "benchmark_description": "Obtains media metrics for key media source extensions functions.", "enabled": true, "charts": {"test_total": {"startup ...                                                                                           ^\nSyntaxError: Unexpected token N in JSON at position 3195\n    at JSON.parse (<anonymous>)\n    at eval (/b/swarming/w/ir/third_party/catapult/tracing/tracing/value/convert_chart_json_cmdline.html:17:23)\n    at Object.loadHTMLFile (/b/swarming/w/ir/third_party/catapult/third_party/vinn/vinn/html_imports_loader.js:140:5)\n    at /b/swarming/w/ir/third_party/catapult/third_party/vinn/vinn/d8_bootstrap.js:151:19\n\n' (truncated)

It's complaining about the "values" attribute of list_of_scalar_values object having value [NaN].
''''
"type": "list_of_scalar_values", "important": true, "values": [NaN], "units": "ms", "page_id": 10},
''''

apparently that isn't appropriate JSON. Now the question is why NaN is being outputted in the first place.

Here's the whole thing: 

"startup_test.html?testType=A&doNotWaitForBodyOnLoad=true": {"std": 0.0, "name": "body_onload_delay.A_buffer_pre_load", "type": "list_of_scalar_values", "important": true, "values": [NaN], "units": "ms", "page_id": 10}

So the buggy test is "startup_test.html?testType=A&doNotWaitForBodyOnLoad=true"

Awesome! I can go and disable that for now.

Yeah, but the real fix here is to fix the code to not output NaN but instead fail the test if it gets NaN.

Also, please only disable for Webview.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/42ce2a929c24d4e6e27ac3409e95458a968d746f

commit 42ce2a929c24d4e6e27ac3409e95458a968d746f
Author: Simon <simonhatch@chromium.org>
Date: Tue Aug 15 21:21:23 2017

Disable media.mse_cases on Webview.

TBR=rnephew@chromium.org

Bug:  755639 
Change-Id: I93dfcfbc6379a057159803e602a106e412098f89
Reviewed-on: https://chromium-review.googlesource.com/615781
Reviewed-by: Simon Hatch <simonhatch@chromium.org>
Commit-Queue: Simon Hatch <simonhatch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#494551}
[modify] https://crrev.com/42ce2a929c24d4e6e27ac3409e95458a968d746f/tools/perf/benchmarks/media.py