Import wpt@558c8b5ac689a857cebcb26926589afffbd6b13b

Using wpt-import in Chromium 0cd1c43.
With Chromium commits locally applied on WPT:
303956b "Enable WPT tests for the Generic Sensor classes"


Build: https://ci.chromium.org/buildbot/chromium.infra.cron/wpt-importer/15712

Note to sheriffs: This CL imports external tests and adds
expectations for those tests; if this CL is large and causes
a few new failures, please fix the failures by adding new
lines to TestExpectations rather than reverting. See:
https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md

TBR=raphael.kubo.da.costa@intel.com

No-Export: true
Change-Id: I2f718a4bdc8986b13086c22436ff18a6f374fa15
Reviewed-on: https://chromium-review.googlesource.com/1015320
Commit-Queue: Blink WPT Bot <blink-w3c-test-autoroller@chromium.org>
Reviewed-by: Blink WPT Bot <blink-w3c-test-autoroller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551409}

third_party/WebKit/LayoutTests/external/WPT_BASE_MANIFEST.json

@@ -247207,7 +247207,7 @@
    "support"
   ],
   "./README.md": [
-   "a4e6c005bc43ac0431dbcee67fb15bbdb8b2a07b",
+   "df1ef73d62520c3e74159cd94889484b2070b68f",
    "support"
   ],
   "./lint.whitelist": [

third_party/WebKit/LayoutTests/external/wpt/README.md

@@ -110,7 +110,7 @@ line syntax is:
 **On Windows**: You will need to preceed the prior command with
 `python` or the path to the python binary.
 ```bash
-python wpt product [tests]
+python wpt run product [tests]
 ```
 
 where `product` is currently `firefox` or `chrome` and `[tests]` is a