[Chromecast] Default desktop windows to 720p + switch for 1080p

chromecast/base/chromecast_switches.cc

Index: chromecast/base/chromecast_switches.cc
diff --git a/chromecast/base/chromecast_switches.cc b/chromecast/base/chromecast_switches.cc
index 0516c031315c22ce527b53d56a5827c978a45e79..8c1c586b8c2e1ce73d3c193d68e85f4f53f83e41 100644
--- a/chromecast/base/chromecast_switches.cc
+++ b/chromecast/base/chromecast_switches.cc
@@ -83,6 +83,10 @@ const char kMemPressureSystemReservedKb[] = "mem-pressure-system-reserved-kb";
 const char kCastInitialScreenWidth[] = "cast-initial-screen-width";
 const char kCastInitialScreenHeight[] = "cast-initial-screen-height";
 
+// When present, desktop cast_shell will create 1080p window (provided display
+// resolution is high enough).  Otherwise, cast_shell defaults to 720p.
+const char kDesktopWindow1080p[] = "desktop-window-1080p";
+
 }  // namespace switches
 
 namespace chromecast {