Run WebGL2 ANGLE tests on Linux Intel HD 530.

Thanks to zmo@ for catching this omission.

BUG=666077
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
NOTRY=true

Review-Url: https://codereview.chromium.org/2623223004
Cr-Commit-Position: refs/heads/master@{#443102}

content/test/gpu/generate_buildbot_json.py

@@ -1366,7 +1366,7 @@ TELEMETRY_GPU_INTEGRATION_TESTS = {
         'build_configs': ['Release'],
         'fyi_only': True,
         'run_on_optional': False,
-        # Only run on the NVIDIA Release and New Intel Release Linux bots
+        # Only run on the NVIDIA Release and Intel Release Linux bots
         'swarming_dimension_sets': [
           {
             'gpu': '10de:104a',
@@ -1376,6 +1376,10 @@ TELEMETRY_GPU_INTEGRATION_TESTS = {
             'gpu': '8086:0412',
             'os': 'Linux'
           },
+          {
+            'gpu': '8086:1912',
+            'os': 'Linux'
+          },
         ],
       },
     ],

testing/buildbot/chromium.gpu.fyi.json

@@ -4646,6 +4646,32 @@
           ]
         }
       },
+      {
+        "args": [
+          "webgl_conformance",
+          "--show-stdout",
+          "--browser=release",
+          "-v",
+          "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc --use-gl=angle",
+          "--webgl-conformance-version=2.0.1",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
+        ],
+        "isolate_name": "telemetry_gpu_integration_test",
+        "name": "webgl2_conformance_angle_tests",
+        "override_compile_targets": [
+          "telemetry_gpu_integration_test_run"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "gpu": "8086:1912",
+              "os": "Linux"
+            }
+          ],
+          "shards": 15
+        }
+      },
       {
         "args": [
           "webgl_conformance",