try to deprecate fFlagsMask from SkLayerDrawLooper

include/effects/SkLayerDrawLooper.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkLayerDrawLooper_DEFINED
 #define SkLayerDrawLooper_DEFINED
 
@@ skipping 48 matching lines @@
      *
      *  fColorMode controls how we compute the final color for the layer:
      *      The layer's paint's color is treated as the SRC
      *      The draw's paint's color is treated as the DST
      *      final-color = Mode(layers-color, draws-color);
      *  Any SkXfermode::Mode will work. Two common choices are:
      *      kSrc_Mode: to use the layer's color, ignoring the draw's
      *      kDst_Mode: to just keep the draw's color, ignoring the layer's
      */
     struct SK_API LayerInfo {
+#ifdef SK_SUPPORT_LEGACY_LAYERDRAWLOOPER_PAINTFLAGS
         uint32_t            fFlagsMask; // SkPaint::Flags
+#endif
         BitFlags            fPaintBits;
         SkXfermode::Mode    fColorMode;
         SkVector            fOffset;
         bool                fPostTranslate; //!< applies to fOffset
 
         /**
          *  Initial the LayerInfo. Defaults to settings that will draw the
          *  layer with no changes: e.g.
          *      fPaintBits == 0
          *      fColorMode == kDst_Mode
@@ skipping 90 matching lines @@
         SkLayerDrawLooper* detachLooper();
 
     private:
         Rec* fRecs;
         Rec* fTopRec;
         int  fCount;
     };
 };
 
 #endif