ozone: Allow ozone evdev/kvm features to be enabled without running on ChromeOS.

base/base_switches.cc

 // Copyright (c) 2012 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/base_switches.h"
 #include "build/build_config.h"
 
 namespace switches {
 
 // Disables the crash reporting.
@@ skipping 93 matching lines @@
 const char kDisableUsbKeyboardDetect[]      = "disable-usb-keyboard-detect";
 #endif
 
 #if defined(OS_POSIX)
 // Used for turning on Breakpad crash reporting in a debug environment where
 // crash reporting is typically compiled but disabled.
 const char kEnableCrashReporterForTesting[] =
     "enable-crash-reporter-for-testing";
 #endif
 
+#if defined(OS_CHROMEOS)
+// Force system compositor mode when set.
+const char kEnableSystemCompositorMode[] = "enable-system-compositor-mode";
+
+// Force disabling of system compositor mode when set.
+const char kDisableSystemCompositorMode[] = "disable-system-compositor-mode";
+#endif
+
 }  // namespace switches