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..6297f5b3e2e4d50796a45584caf4898708963921 100644
--- a/chromecast/public/cast_sys_info.h
+++ b/chromecast/public/cast_sys_info.h
@@ -55,6 +55,19 @@ class CastSysInfo {
   virtual std::string GetWifiInterface() = 0;
   // Returns the name of the software AP interface.
   virtual std::string GetApInterface() = 0;
+
+  // Returns the GL_VENDOR string of GPU driver. Must match the value that would
+  // be obtained from a GL context, but implementations must *not* create a GL
+  // context.
+  virtual std::string GetGlVendor() = 0;
+  // Returns the GL_RENDERER string of GPU driver. Must match the value that
+  // would be obtained from a GL context, but implementations must *not* create
+  // a GL context.
+  virtual std::string GetGlRenderer() = 0;
+  // Returns the GL_VERSION string of GPU driver. Must match the value that
+  // would be obtained from a GL context, but implementations must *not* create
+  // a GL context.
+  virtual std::string GetGlVersion() = 0;
 };
 
 }  // namespace chromecast