Add GL strings to CastSysInfo interface and use to configure GPU

chromecast/base/cast_sys_info_dummy.h

 // Copyright 2015 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 CHROMECAST_BASE_CAST_SYS_INFO_DUMMY_H_
 #define CHROMECAST_BASE_CAST_SYS_INFO_DUMMY_H_
 
 #include "base/macros.h"
 #include "chromecast/public/cast_sys_info.h"
 
@@ skipping 11 matching lines @@
   std::string GetProductName() override;
   std::string GetDeviceModel() override;
   std::string GetBoardName() override;
   std::string GetBoardRevision() override;
   std::string GetManufacturer() override;
   std::string GetSystemBuildNumber() override;
   std::string GetFactoryCountry() override;
   std::string GetFactoryLocale(std::string* second_locale) override;
   std::string GetWifiInterface() override;
   std::string GetApInterface() override;
+  std::string GetGlVendor() override;
+  std::string GetGlRenderer() override;
+  std::string GetGlVersion() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CastSysInfoDummy);
 };
 
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BASE_CAST_SYS_INFO_DUMMY_H_