Mark conformance/extensions/oes-texture-half-float.html on Linux / ANGLE.

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 03868520b5425c86e64fc16d581f210e9d1ff182..64a97acae5e09b8b8038d6e6b351a58ef159ec52 100644
--- a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
@@ -200,6 +200,10 @@ class WebGLConformanceExpectations(GpuTestExpectations):
         ['mac', ('amd', 0x6821)], bug=599272)
 
     # Linux failures
+    # OpenGL
+    self.Fail('conformance/extensions/oes-texture-half-float.html',
+        ['linux', 'opengl'], bug=607283)
+
     # NVIDIA
     self.Fail('conformance/extensions/angle-instanced-arrays.html',
               ['linux', 'nvidia'], bug=544989) # Too flaky to retry