Run WebGL conformance tests against ANGLE's Vulkan backend.

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Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I95256ed99a046297a4f38af2e25d1f72a4d711a3
Reviewed-on: https://chromium-review.googlesource.com/c/1284393
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602400}

content/test/gpu/gpu_tests/gpu_test_expectations.py

@@ -4,7 +4,7 @@
 
 from gpu_tests import test_expectations
 
-ANGLE_CONDITIONS = ['d3d9', 'd3d11', 'opengl', 'no_angle']
+ANGLE_CONDITIONS = ['d3d9', 'd3d11', 'opengl', 'vulkan', 'no_angle']
 CMD_DECODER_CONDITIONS = ['passthrough', 'no_passthrough']
 GPU_CONDITIONS = ['amd', 'arm', 'broadcom', 'hisilicon', 'intel', 'imagination',
                   'nvidia', 'qualcomm', 'vivante']
@@ -168,6 +168,8 @@ class GpuTestExpectations(test_expectations.TestExpectations):
           return 'd3d9'
         elif 'OpenGL' in gl_renderer:
           return 'opengl'
+        elif 'Vulkan' in gl_renderer:
+          return 'vulkan'
     return 'no_angle'
 
   def _GetCommandDecoder(self, gpu_info):

testing/buildbot/test_suites.pyl

@@ -1375,6 +1375,15 @@
           'shards': 2,
         },
       },
+      'webgl_conformance_vulkan_passthrough': {
+        'telemetry_test_name': 'webgl_conformance',
+        'args': [
+          '--extra-browser-args=--use-angle=vulkan --use-cmd-decoder=passthrough',
+        ],
+        'swarming': {
+          'shards': 2,
+        },
+      },
     },
 
     # These run everywhere ANGLE does; currently, Win and Linux NVIDIA