Suppress flaky getBufferSubData failures on Linux without ANGLE.

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

Index: content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
diff --git a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
index 77a6e944e8465f87318d69e5ea44f44bf58440ba..253adc26191d8fbd74871a81dbacebe183116e9f 100644
--- a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
@@ -533,6 +533,10 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('conformance2/reading/read-pixels-pack-parameters.html',
         ['linux', 'opengl'], bug=483282)
 
+    # Linux without ANGLE only
+    self.Flaky('conformance2/buffers/getBufferSubData.html',
+               ['linux', 'no_angle'], bug=650123)
+
     # Linux NVIDIA
     # This test is flaky both with and without ANGLE.
     self.Flaky('deqp/functional/gles3/texturespecification/' +