Failing consistently:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/android-marshmallow-arm64-rel?limit=200

eg: https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/android-marshmallow-arm64-rel/11636

Failing on the following two tests:
AndroidStreamReaderURLLoaderTest.ReadFakeStream
AndroidStreamReaderURLLoaderTest.ValidRangeRequest

Those tests are crashing with the error:
"[ERROR:validation_errors.cc(76)] Invalid message: VALIDATION_ERROR_UNEXPECTED_INVALID_HANDLE (invalid field 1)"

Looks like some mojo error? https://chromium-review.googlesource.com/c/chromium/src/+/1391913 shows up in the first failing build, and reverting locally appears to cause the tests to pass. Assigning to author of CL.