add localmatrix parameter to shader's asNewEffect

src/core/SkBitmapProcShader.cpp

Index: src/core/SkBitmapProcShader.cpp
diff --git a/src/core/SkBitmapProcShader.cpp b/src/core/SkBitmapProcShader.cpp
index 00d938be2729c4559da807437f52b12d1dc82045..d726a46f118e960c583a30bc6fd542d6a87ec3e9 100644
--- a/src/core/SkBitmapProcShader.cpp
+++ b/src/core/SkBitmapProcShader.cpp
@@ -393,7 +393,8 @@ static SkScalar get_combined_min_stretch(const SkMatrix& viewMatrix, const SkMat
     }
 }
 
-GrEffectRef* SkBitmapProcShader::asNewEffect(GrContext* context, const SkPaint& paint) const {
+GrEffectRef* SkBitmapProcShader::asNewEffect(GrContext* context, const SkPaint& paint,
+                                             const SkMatrix* localMatrix) const {
     SkMatrix matrix;
     matrix.setIDiv(fRawBitmap.width(), fRawBitmap.height());
 
@@ -401,6 +402,13 @@ GrEffectRef* SkBitmapProcShader::asNewEffect(GrContext* context, const SkPaint&
     if (!this->getLocalMatrix().invert(&lmInverse)) {
         return NULL;
     }
+    if (localMatrix) {
+        SkMatrix inv;
+        if (!localMatrix->invert(&inv)) {
+            return NULL;
+        }
+        lmInverse.postConcat(inv);
+    }
     matrix.preConcat(lmInverse);
 
     SkShader::TileMode tm[] = {