Use NV_draw_buffers to implement EXT_draw_buffers

gpu/command_buffer/service/test_helper.cc

Index: gpu/command_buffer/service/test_helper.cc
diff --git a/gpu/command_buffer/service/test_helper.cc b/gpu/command_buffer/service/test_helper.cc
index 2f0e9c995563697f342e6b647fd134a2d57262d2..bafa1e471a78702f7d5de4244e0e43edbb25d1e1 100644
--- a/gpu/command_buffer/service/test_helper.cc
+++ b/gpu/command_buffer/service/test_helper.cc
@@ -392,6 +392,17 @@ void TestHelper::SetupFeatureInfoInitExpectationsWithGLVersion(
         .RetiresOnSaturation();
 #endif
   }
+
+  if (strstr(extensions, "GL_EXT_draw_buffers") ||
+      strstr(extensions, "GL_ARB_draw_buffers") ||
+      (is_es3 && strstr(extensions, "GL_NV_draw_buffers"))) {
+    EXPECT_CALL(*gl, GetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, _))
+        .WillOnce(SetArgumentPointee<1>(8))
+        .RetiresOnSaturation();
+    EXPECT_CALL(*gl, GetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, _))
+        .WillOnce(SetArgumentPointee<1>(8))
+        .RetiresOnSaturation();
+  }
 }
 
 void TestHelper::SetupExpectationsForClearingUniforms(