Do not lose secondary gpus and make sure to have an active gpu on multiple gpu configurations

gpu/config/gpu_util.h

Index: gpu/config/gpu_util.h
diff --git a/gpu/config/gpu_util.h b/gpu/config/gpu_util.h
index 6b89303d3bbe58acafc8c463be39508d4d4227e5..a2dae66493d1a7e9e629f2e21ba1d21085413079 100644
--- a/gpu/config/gpu_util.h
+++ b/gpu/config/gpu_util.h
@@ -34,6 +34,14 @@ GPU_EXPORT void ApplyGpuDriverBugWorkarounds(
 GPU_EXPORT void StringToFeatureSet(
     const std::string& str, std::set<int>* feature_set);
 
+// With provided command line, fill gpu_info->secondary_gpus with parsed
+// secondary vendor and device ids.
+GPU_EXPORT void ParseSecondaryGpuDevicesFromCommandLine(
+    const base::CommandLine& command_line,
+    const std::string& secondary_vendor_ids_key,

[Zhenyao Mo, 2016/04/19 21:05:27]

You really don't need to pass in the two keys here.  You can just directly use
them in the function. We never call them with two keys as empty string.

[Julien Isorce Samsung, 2016/04/20 17:19:21]

Yup but there is the "testing" version of the key. I need to figure out how to
do it then.

+    const std::string& secondary_device_ids_key,
+    GPUInfo* gpu_info);

[Zhenyao Mo, 2016/04/19 21:05:27]

Also, can you add a unit test in gpu_util_unittest.cc for this function?

[Julien Isorce Samsung, 2016/04/20 17:19:21]

Oki

+
 }  // namespace gpu
 
 #endif  // GPU_CONFIG_GPU_UTIL_H_