webgl: suppress tests failing on Win7 Release ATI GPU bot.

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 e6351a630699af3ac4a207fff841274019ec3ca3..3331a7a3281ffff61847299a6655f24c8753398b 100644
--- a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
@@ -56,6 +56,10 @@ class WebGLConformanceExpectations(GpuTestExpectations):
     # Win / AMD failures
     self.Fail('conformance/textures/texparameter-test.html',
         ['win', 'amd', 'd3d9'], bug=839) # angle bug ID
+    self.Fail('conformance/extensions/angle-instanced-arrays.html',
+        ['win', 'amd', 'd3d9'], bug=475095)
+    self.Fail('conformance/rendering/more-than-65536-indices.html',
+        ['win', 'amd', 'd3d9'], bug=475095)
 
     # Win / D3D9 failures
     # Skipping these tests because they're causing assertion failures.