switch to isABitmap, deprecate SK_SUPPORT_LEGACY_SHADERBITMAPTYPE

src/core/SkShader.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAtomics.h"
 #include "SkBitmapProcShader.h"
 #include "SkColorShader.h"
@@ skipping 188 matching lines @@
             mc = kFixedStepInX_MatrixClass;
         } else {
             mc = kPerspective_MatrixClass;
         }
     }
     return mc;
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
-SkShader::BitmapType SkShader::asABitmap(SkBitmap*, SkMatrix*, TileMode*) const {
-    return kNone_BitmapType;
-}
-
 SkShader::GradientType SkShader::asAGradient(GradientInfo* info) const {
     return kNone_GradientType;
 }
 
 const GrFragmentProcessor* SkShader::asFragmentProcessor(GrContext*, const SkMatrix&,
                                                          const SkMatrix*, SkFilterQuality,
                                                          GrProcessorDataManager*)  const {
     return nullptr;
 }
 
@@ skipping 145 matching lines @@
 #include "SkEmptyShader.h"
 
 void SkEmptyShader::toString(SkString* str) const {
     str->append("SkEmptyShader: (");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif