gpu: Unify code to initialize dual-gpu mode.

gpu/config/gpu_util.cc

Index: gpu/config/gpu_util.cc
diff --git a/gpu/config/gpu_util.cc b/gpu/config/gpu_util.cc
index 995c87c7e44c327e745c35a3c55b2ba6e14b9cfd..e27c292fecf6256c352ed0e2dfb4705547d0e2d7 100644
--- a/gpu/config/gpu_util.cc
+++ b/gpu/config/gpu_util.cc
@@ -17,6 +17,7 @@
 #include "gpu/config/gpu_info_collector.h"
 #include "gpu/config/gpu_switches.h"
 #include "ui/gl/gl_switches.h"
+#include "ui/gl/gpu_switching_manager.h"
 
 namespace gpu {
 
@@ -145,4 +146,16 @@ void ParseSecondaryGpuDevicesFromCommandLine(
   }
 }
 
+void InitializeDualGpusIfSupported(
+    const std::set<int>& driver_bug_workarounds) {
+  ui::GpuSwitchingManager* switching_manager =
+      ui::GpuSwitchingManager::GetInstance();
+  if (!switching_manager->SupportsDualGpus())
+    return;
+  if (driver_bug_workarounds.count(gpu::FORCE_DISCRETE_GPU) == 1)
+    ui::GpuSwitchingManager::GetInstance()->ForceUseOfDiscreteGpu();
+  else if (driver_bug_workarounds.count(gpu::FORCE_INTEGRATED_GPU) == 1)
+    ui::GpuSwitchingManager::GetInstance()->ForceUseOfIntegratedGpu();
+}
+
 }  // namespace gpu