add flag to guard future Skia CL

skia/config/SkUserConfig.h

 /*
  * Copyright (C) 2006 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
@@ skipping 196 matching lines @@
 // Remove these as we update our sites.
 //
 #ifndef    SK_SUPPORT_LEGACY_GETTOPDEVICE
 #   define SK_SUPPORT_LEGACY_GETTOPDEVICE
 #endif
 
 #ifndef    SK_SUPPORT_LEGACY_GETDEVICE
 #   define SK_SUPPORT_LEGACY_GETDEVICE
 #endif
 
+#ifndef    SK_SUPPORT_LEGACY_LAYER_BITMAP_IMAGEFILTERS
+#   define SK_SUPPORT_LEGACY_LAYER_BITMAP_IMAGEFILTERS
+#endif
+
 #ifndef    SK_IGNORE_ETC1_SUPPORT
 #   define SK_IGNORE_ETC1_SUPPORT
 #endif
 
 #ifndef    SK_IGNORE_GPU_DITHER
 #   define SK_IGNORE_GPU_DITHER
 #endif
 ///////////////////////// Imported from BUILD.gn and skia_common.gypi
 
 /* In some places Skia can use static initializers for global initialization,
@@ skipping 17 matching lines @@
 #define SK_ATTR_DEPRECATED          SK_NOTHING_ARG1
 #define SK_ENABLE_INST_COUNT        0
 #define GR_GL_CUSTOM_SETUP_HEADER   "GrGLConfig_chrome.h"
 
 // Blink layout tests are baselined to Clang optimizing through the UB in SkDivBits.
 #define SK_SUPPORT_LEGACY_DIVBITS_UB
 
 // ===== End Chrome-specific definitions =====
 
 #endif