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

gpu/config/gpu_info_collector.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_INFO_COLLECTOR_H_
 #define GPU_CONFIG_GPU_INFO_COLLECTOR_H_
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "gpu/config/gpu_info.h"
@@ skipping 28 matching lines @@
 // Merge GPUInfo from CollectContextGraphicsInfo into basic GPUInfo.
 // This is platform specific, depending on which info are collected at which
 // stage.
 GPU_EXPORT void MergeGPUInfo(GPUInfo* basic_gpu_info,
                              const GPUInfo& context_gpu_info);
 
 // MergeGPUInfo() when GL driver is used.
 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_