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

chromecast/graphics/graphics_properties_default.cc

 // 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.
 
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "chromecast/base/chromecast_switches.h"
+#include "chromecast/base/init_command_line_shlib.h"
 #include "chromecast/public/graphics_properties_shlib.h"
 
 namespace chromecast {
 
 bool GraphicsPropertiesShlib::IsSupported(
     Resolution resolution,
     const std::vector<std::string>& argv) {
-  return true;
+  InitCommandLineShlib(argv);
+  switch (resolution) {
+    case Resolution::k1080p:
+      return base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDesktopWindow1080p);
+    case Resolution::kUHDTV:
+      return false;
+    default:
+      NOTREACHED();
+      return false;
+  }
 }
 
 }  // namespace chromecast