Revert of switch to isABitmap, deprecate SK_SUPPORT_LEGACY_SHADERBITMAPTYPE

src/core/SkShader.cpp

Index: src/core/SkShader.cpp
diff --git a/src/core/SkShader.cpp b/src/core/SkShader.cpp
index 2a1c28e0cf8684ebcc57035080f12b9f5f15eb67..b3edf47dfd3c921c3abbb09bf8a533b54b7fa909 100644
--- a/src/core/SkShader.cpp
+++ b/src/core/SkShader.cpp
@@ -206,6 +206,10 @@
 
 //////////////////////////////////////////////////////////////////////////////
 
+SkShader::BitmapType SkShader::asABitmap(SkBitmap*, SkMatrix*, TileMode*) const {
+    return kNone_BitmapType;
+}
+
 SkShader::GradientType SkShader::asAGradient(GradientInfo* info) const {
     return kNone_GradientType;
 }