Add GL strings to CastSysInfo interface and use to configure GPU

chromecast/public/cast_sys_info.h

Index: chromecast/public/cast_sys_info.h
diff --git a/chromecast/public/cast_sys_info.h b/chromecast/public/cast_sys_info.h
index 95d1da6e664f0e7cb50e79d8c498537fe1be7dd0..f683a617570fe6bc2e4ac33a633fa7e59b6fe1c1 100644
--- a/chromecast/public/cast_sys_info.h
+++ b/chromecast/public/cast_sys_info.h
@@ -55,6 +55,11 @@ class CastSysInfo {
   virtual std::string GetWifiInterface() = 0;
   // Returns the name of the software AP interface.
   virtual std::string GetApInterface() = 0;
+
+  // Returns the vendor name of the GPU.
+  virtual std::string GetGpuVendor() = 0;
+  // Returns the model name of the GPU.
+  virtual std::string GetGpuModel() = 0;
 };
 
 }  // namespace chromecast