Fix CTM scaling and clipping of SkRectShaderImageFilter.

src/effects/SkRectShaderImageFilter.cpp

Index: src/effects/SkRectShaderImageFilter.cpp
diff --git a/src/effects/SkRectShaderImageFilter.cpp b/src/effects/SkRectShaderImageFilter.cpp
index 18e38470bc9ba3f5e907ae8e3fcade472f0a1c9d..27b39d7fb1dde27fb3926738b5df9edd570af91c 100644
--- a/src/effects/SkRectShaderImageFilter.cpp
+++ b/src/effects/SkRectShaderImageFilter.cpp
@@ -69,8 +69,8 @@ bool SkRectShaderImageFilter::onFilterImage(Proxy* proxy,
     SkCanvas canvas(device.get());
     SkPaint paint;
     paint.setShader(fShader);
-    SkMatrix matrix;
-    matrix.setTranslate(-SkIntToScalar(bounds.fLeft), -SkIntToScalar(bounds.fTop));
+    SkMatrix matrix(ctm);
+    matrix.postTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
     fShader->setLocalMatrix(matrix);
     SkRect rect = SkRect::MakeWH(SkIntToScalar(bounds.width()), SkIntToScalar(bounds.height()));
     canvas.drawRect(rect, paint);