Test WebGL2 on ANGLE's GL backed on Windows/NVIDIA.

content/test/gpu/generate_buildbot_json.py

Index: content/test/gpu/generate_buildbot_json.py
diff --git a/content/test/gpu/generate_buildbot_json.py b/content/test/gpu/generate_buildbot_json.py
index 9051f2003f709206368132202e13a7a8cbc36f35..4327074ec472d9b527911f1960234a485915d998 100755
--- a/content/test/gpu/generate_buildbot_json.py
+++ b/content/test/gpu/generate_buildbot_json.py
@@ -1630,6 +1630,41 @@ TELEMETRY_GPU_INTEGRATION_TESTS = {
       'shards': 15,
     },
   },
+  'webgl2_conformance_gl_tests': {
+    'tester_configs': [
+      {
+         # The WebGL 2.0 conformance tests take over an hour to run on
+         # the Debug bots, which is too long.
+        'build_configs': ['Release'],
+        'predicate': Predicates.FYI_ONLY,
+        # Only run on the NVIDIA Release Windows bots.
+        'swarming_dimension_sets': [
+          {
+            'gpu': '10de:104a',
+            'os': 'Windows-2008ServerR2-SP1'
+          },
+        ],
+      },
+    ],
+    'target_name': 'webgl_conformance',
+    'extra_browser_args': [
+      '--use-angle=gl',
+    ],
+    'args': [
+      '--webgl-conformance-version=2.0.1',
+      # The current working directory when run via isolate is
+      # out/Debug or out/Release. Reference this file relatively to
+      # it.
+      '--read-abbreviated-json-results-from=' + \
+      '../../content/test/data/gpu/webgl2_conformance_tests_output.json',
+    ],
+    'asan_args': ['--is-asan'],
+    'swarming': {
+      # These tests currently take about an hour and fifteen minutes
+      # to run. Split them into roughly 5-minute shards.
+      'shards': 15,
+    },
+  },
 }
 
 # These isolated tests don't use telemetry. They need to be placed in the