implement isABitmap for imageshader, return localmatrix for bitmap's impl

src/core/SkBitmapProcShader.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProcShader.h"
 #include "SkBitmapProcState.h"
 #include "SkBitmapProvider.h"
@@ skipping 254 matching lines @@
     fRawBitmap = src;
     fTileModeX = (uint8_t)tmx;
     fTileModeY = (uint8_t)tmy;
 }
 
 bool SkBitmapProcShader::onIsABitmap(SkBitmap* texture, SkMatrix* texM, TileMode xy[]) const {
     if (texture) {
         *texture = fRawBitmap;
     }
     if (texM) {
-        texM->reset();
+        *texM = this->getLocalMatrix();
     }
     if (xy) {
         xy[0] = (TileMode)fTileModeX;
         xy[1] = (TileMode)fTileModeY;
     }
     return true;
 }
 
 sk_sp<SkFlattenable> SkBitmapProcShader::CreateProc(SkReadBuffer& buffer) {
     SkMatrix lm;
@@ skipping 180 matching lines @@
         inner = GrSimpleTextureEffect::Make(texture, std::move(colorSpaceXform), matrix, params);
     }
 
     if (kAlpha_8_SkColorType == fRawBitmap.colorType()) {
         return GrFragmentProcessor::MulOutputByInputUnpremulColor(std::move(inner));
     }
     return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner));
 }
 
 #endif