Add command line option to enable PPAPI win32k lockdown.

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 272 matching lines @@
 extern const char kDisableCoreAnimationPlugins[];
 extern const char kDisableThreadedEventHandlingMac[];
 #endif
 
 #if defined(OS_WIN)
 // This switch contains the device scale factor passed to certain processes
 // like renderers, etc.
 CONTENT_EXPORT extern const char kDeviceScaleFactor[];
 CONTENT_EXPORT extern const char kDisableLegacyIntermediateWindow[];
 CONTENT_EXPORT extern const char kDisableWin32kRendererLockDown[];
+CONTENT_EXPORT extern const char kEnableWin32kLockDownMimeTypes[];
 CONTENT_EXPORT extern const char kEnableAcceleratedVpxDecode[];
 // Switch to pass the font cache shared memory handle to the renderer.
 CONTENT_EXPORT extern const char kFontCacheSharedHandle[];
 CONTENT_EXPORT extern const char kMemoryPressureThresholdsMb[];
 CONTENT_EXPORT extern const char kTraceExportEventsToETW[];
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_