[Chromecast] Set Cast Ozone display size correctly first time

chromecast/base/chromecast_switches.h

Index: chromecast/base/chromecast_switches.h
diff --git a/chromecast/base/chromecast_switches.h b/chromecast/base/chromecast_switches.h
index 9e0c25322a326c64563e79b3d859c49237f27e1f..c4cdd6f8b97aa375b906e83b52899e96206cfa3b 100644
--- a/chromecast/base/chromecast_switches.h
+++ b/chromecast/base/chromecast_switches.h
@@ -50,6 +50,10 @@ extern const char kAlsaFixedOutputSampleRate[];
 // Memory pressure switches
 extern const char kMemPressureSystemReservedKb[];
 
+// GPU switches
+extern const char kCastInitialScreenWidth[];
+extern const char kCastInitialScreenHeight[];
+
 }  // namespace switches
 
 namespace chromecast {