Identify the active GPU using GL strings in multiple GPU situation.

gpu/config/gpu_info_collector.h

Index: gpu/config/gpu_info_collector.h
diff --git a/gpu/config/gpu_info_collector.h b/gpu/config/gpu_info_collector.h
index ad3ae95385309fd84ec9d5f93ffc979629acec11..0fda54b8ca33579b35d59ccab0be8aada3a83fec 100644
--- a/gpu/config/gpu_info_collector.h
+++ b/gpu/config/gpu_info_collector.h
@@ -46,6 +46,10 @@ GPU_EXPORT void MergeGPUInfo(GPUInfo* basic_gpu_info,
 GPU_EXPORT void MergeGPUInfoGL(GPUInfo* basic_gpu_info,
                                const GPUInfo& context_gpu_info);
 
+// If more than one GPUs are identified, and GL strings are available,
+// identify the active GPU based on GL strings.
+GPU_EXPORT void IdentifyActiveGPU(GPUInfo* gpu_info);
+
 }  // namespace gpu
 
 #endif  // GPU_CONFIG_GPU_INFO_COLLECTOR_H_