SkPDF: flip saveLayer rightside up

src/pdf/SkPDFShader.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 "SkPDFShader.h"
 
@@ skipping 688 matching lines @@
             get_pdf_shader_by_state(doc, dpi, &alphaToLuminosityState));
 
     std::unique_ptr<SkStreamAsset> alphaStream(create_pattern_fill_content(-1, bbox));
 
     auto resources =
         get_gradient_resource_dict(luminosityShader.get(), nullptr);
 
     auto alphaMask = SkPDFMakeFormXObject(std::move(alphaStream),
                                           SkPDFUtils::RectToArray(bbox),
                                           std::move(resources),
+                                          SkMatrix::I(),
                                           "DeviceRGB");
     return SkPDFGraphicState::GetSMaskGraphicState(
             alphaMask.get(), false,
             SkPDFGraphicState::kLuminosity_SMaskMode, doc->canon());
 }
 
 SkPDFAlphaFunctionShader* SkPDFAlphaFunctionShader::Create(
         SkPDFDocument* doc,
         SkScalar dpi,
         std::unique_ptr<SkPDFShader::State>* autoState) {
@@ skipping 690 matching lines @@
     return false;
 }
 
 void SkPDFShader::State::AllocateGradientInfoStorage() {
     fColorData.set(sk_malloc_throw(
                fInfo.fColorCount * (sizeof(SkColor) + sizeof(SkScalar))));
     fInfo.fColors = reinterpret_cast<SkColor*>(fColorData.get());
     fInfo.fColorOffsets =
             reinterpret_cast<SkScalar*>(fInfo.fColors + fInfo.fColorCount);
 }