Add capability for GPU blacklist to manage GPU switching.

content/browser/gpu/gpu_data_manager_impl.h

Index: content/browser/gpu/gpu_data_manager_impl.h
===================================================================
--- content/browser/gpu/gpu_data_manager_impl.h	(revision 156195)
+++ content/browser/gpu/gpu_data_manager_impl.h	(working copy)
@@ -38,6 +38,7 @@
       const std::string& gpu_blacklist_json,
       const content::GPUInfo& gpu_info) OVERRIDE;
   virtual content::GpuFeatureType GetBlacklistedFeatures() const OVERRIDE;
+  virtual content::GpuSwitchingOption GetGpuSwitchingOption() const OVERRIDE;
   virtual base::ListValue* GetBlacklistReasons() const OVERRIDE;
   virtual std::string GetBlacklistVersion() const OVERRIDE;
   virtual content::GPUInfo GetGPUInfo() const OVERRIDE;
@@ -120,6 +121,8 @@
   content::GpuFeatureType gpu_feature_type_;
   content::GpuFeatureType preliminary_gpu_feature_type_;
 
+  content::GpuSwitchingOption gpu_switching_;
+
   content::GPUInfo gpu_info_;
   mutable base::Lock gpu_info_lock_;