Balance WebGL tests with validating CB between Intel and Nvidia bots

Run WebGL2 with validating CB on Intel and WebGL1 on Nvidia.
Also switches WebGL1 D3D11 validating to default on AMD.

Intel FYI, ANGLE and Optional run:
webgl2_conformance_tests
webgl_conformance_d3d9_passthrough_tests
webgl_conformance_gl_passthrough_tests
webgl_conformance_vulkan_passthrough_tests
webgl_conformance_tests
Intel FYI and ANGLE also run
webgl2_conformance_d3d11_validating_tests
webgl2_conformance_gl_passthrough_tests

Nvidia FYI, ANGLE and Optional run:
webgl2_conformance_tests
webgl_conformance_d3d11_validating_tests
webgl_conformance_d3d9_passthrough_tests
webgl_conformance_d3d9_validating_tests
webgl_conformance_gl_passthrough_tests
webgl_conformance_tests
Nvidia FYI and ANGLE also run
webgl2_conformance_gl_passthrough_tests

AMD FYI and ANGLE run:
webgl_conformance_d3d9_passthrough_tests
webgl_conformance_vulkan_passthrough_tests
webgl_conformance_tests
AMD FYI also runs:
webgl2_conformance_tests
webgl_conformance_d3d9_validating_tests

Bug: 942287, 882580
TBR=kbr

Change-Id: I66f00bf9e9b7d1757b0f630a0151fed88bbc6dc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1525467
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641217}
2 files changed