add --enable-spatial-navigation flag for testing

content/public/common/content_switches.h

 // 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.
 
 // Defines all the "content" command-line switches.
 
 #ifndef CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 
 #include "build/build_config.h"
@@ skipping 105 matching lines @@
 extern const char kEnableMonitorProfile[];
 extern const char kEnableUserMediaScreenCapturing[];
 extern const char kEnablePinch[];
 extern const char kDisablePinch[];
 extern const char kEnablePreparsedJsCaching[];
 CONTENT_EXPORT extern const char kEnablePrivilegedWebGLExtensions[];
 extern const char kEnablePruneGpuCommandBuffers[];
 extern const char kEnableSSLCachedInfo[];
 extern const char kEnableSandboxLogging[];
 extern const char kEnableSeccompSandbox[];
+extern const char kEnableSpatialNavigation[];
 CONTENT_EXPORT extern const char kEnableSoftwareCompositingGLAdapter[];
 CONTENT_EXPORT extern const char kEnableSmoothScrolling[];
 CONTENT_EXPORT extern const char kEnableStatsTable[];
 extern const char kEnableStrictSiteIsolation[];
 CONTENT_EXPORT extern const char kEnableThreadedCompositing[];
 CONTENT_EXPORT extern const char kDisableThreadedCompositing[];
 extern const char kEnableVirtualGLContexts[];
 CONTENT_EXPORT extern const char kEnableTcpFastOpen[];
 CONTENT_EXPORT extern const char kDisableAcceleratedVideoDecode[];
 extern const char kEnableViewport[];
@@ skipping 101 matching lines @@
 extern const char kDisableCarbonInterposing[];
 #endif
 
 #if defined(USE_AURA)
 CONTENT_EXPORT extern const char kTestCompositor[];
 #endif
 
 }  // namespace switches
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_