Implement GL_EXT_occlusion_query_boolean on OSX

gpu/command_buffer/tests/occlusion_query_unittests.cc

Index: gpu/command_buffer/tests/occlusion_query_unittests.cc
diff --git a/gpu/command_buffer/tests/occlusion_query_unittests.cc b/gpu/command_buffer/tests/occlusion_query_unittests.cc
index ddf1db90be9b35e2d10bd13ecdadc7ea9d52ff81..29ab481d8ce16ac37281972219c0f6d5d412473e 100644
--- a/gpu/command_buffer/tests/occlusion_query_unittests.cc
+++ b/gpu/command_buffer/tests/occlusion_query_unittests.cc
@@ -66,6 +66,11 @@ void OcclusionQueryTest::DrawRect(float x, float z, float scale, float* color) {
 }
 
 TEST_F(OcclusionQueryTest, Occlusion) {
+#ifdef OS_MACOSX
+  EXPECT_TRUE(GLTestHelper::HasExtension("GL_EXT_occlusion_query_boolean"))
+      << "GL_EXT_occlusion_query_boolean is required on OSX";
+#endif
+
   if (!GLTestHelper::HasExtension("GL_EXT_occlusion_query_boolean")) {
     return;
   }