SkPDF: remove all globally references SkPDFObjects

src/pdf/SkPDFCanon.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImage.h"
 #include "SkPDFBitmap.h"
 #include "SkPDFCanon.h"
@@ skipping 131 matching lines @@
     if (const SkImage** img = fBitmapToImageMap.find(key)) {
         return *img;
     }
     if (SkImage* image = SkImage::NewFromBitmap(bm)) {
         return *fBitmapToImageMap.set(key, image);
     }
     SkBitmap n32bitmap;  // SkImage::NewFromBitmap can be finicky.
     bm.copyTo(&n32bitmap, kN32_SkColorType);
     return *fBitmapToImageMap.set(key, SkImage::NewFromBitmap(n32bitmap));
 }
+
+sk_sp<SkPDFStream> SkPDFCanon::makeInvertFunction() {
+    if (fInvertFunction) {
+        return fInvertFunction;
+    }
+    fInvertFunction = SkPDFGraphicState::MakeInvertFunction();
+    return fInvertFunction;
+}
+sk_sp<SkPDFDict> SkPDFCanon::makeNoSmaskGraphicState() {
+    if (fNoSmaskGraphicState) {
+        return fNoSmaskGraphicState;
+    }
+    fNoSmaskGraphicState = SkPDFGraphicState::MakeNoSmaskGraphicState();
+    return fNoSmaskGraphicState;
+}
+sk_sp<SkPDFArray> SkPDFCanon::makeRangeObject() {
+    if (fRangeObject) {
+        return fRangeObject;
+    }
+    fRangeObject = SkPDFShader::MakeRangeObject();
+    return fRangeObject;
+}