Added support for GPU-based expectations

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

Index: content/test/gpu/gpu_tests/webgl_conformance_expectations.py
diff --git a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
index 05a68946b2a9765cbed63bff036b688e89684511..05a21c54555e49c34510058d661a73db7a5eb8b7 100644
--- a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
@@ -9,9 +9,13 @@ from telemetry.page import test_expectations
 # mac leopard snowleopard lion mountainlion
 # linux chromeos android
 # nvidia amd intel
+# Specific gpu's can be listed as a tuple with vendor name and device ID.
+# Example: ('nvidia', 0x1234)
+# Device ID's must be paired with a gpu vendor.
 
 class WebGLConformanceExpectations(test_expectations.TestExpectations):
   def SetExpectations(self):
     # Sample Usage:
-    # self.Fail("gl-enable-vertex-attrib.html", ["mac", "win"], bug=1234)
+    # self.Fail("gl-enable-vertex-attrib.html",
+    #     ['mac', 'amd', ('nvidia', 0x1234)], bug=123)
     self.Fail('uniform-samplers-test.html', ['android'], bug=272080)