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

gpu/config/gpu_util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GPU_CONFIG_GPU_UTIL_H_
 #define GPU_CONFIG_GPU_UTIL_H_
 
 #include <set>
 #include <string>
 
@@ skipping 16 matching lines @@
 // With provided GPUInfo, compute the driver bug workarounds and disabled
 // extensions for the current system, and append the |command_line|.
 GPU_EXPORT void ApplyGpuDriverBugWorkarounds(
     const GPUInfo& gpu_info,
     base::CommandLine* command_line);
 
 // |str| is in the format of "feature1,feature2,...,featureN".
 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,
+    bool use_testing_switches,
+    GPUInfo* gpu_info);
+
 }  // namespace gpu
 
 #endif  // GPU_CONFIG_GPU_UTIL_H_