SkPDF: skpdfdocument and skpdfpage use skpdfdevice in a const way

src/pdf/SkPDFPage.h

 
 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFPage_DEFINED
@@ skipping 13 matching lines @@
     A SkPDFPage contains meta information about a page, is used in the page
     tree and points to the content of the page.
 */
 class SkPDFPage : public SkPDFDict {
     SK_DECLARE_INST_COUNT(SkPDFPage)
 public:
     /** Create a PDF page with the passed PDF device.  The device need not
      *  have content on it yet.
      *  @param content    The page content.
      */
-    explicit SkPDFPage(SkPDFDevice* content);
+    explicit SkPDFPage(const SkPDFDevice* content);
     ~SkPDFPage();
 
     /** Before a page and its contents can be sized and emitted, it must
      *  be finalized.  No changes to the PDFDevice will be honored after
      *  finalizePage has been called.  This function adds the page content
      *  to the passed catalog, so it must be called for each document
      *  that the page is part of.
      *  @param catalog         The catalog to add page content objects to.
      *  @param firstPage       Indicate if this is the first page of a document.
      *  @param newResourceObjects All the resource objects (recursively) used on
@@ skipping 34 matching lines @@
 
     /** Returns a SkPDFGlyphSetMap which represents glyph usage of every font
      *  that shows on this page.
      */
     const SkPDFGlyphSetMap& getFontGlyphUsage() const;
 
     SkPDFObject* getContentStream() const;
 
 private:
     // Multiple pages may reference the content.
-    SkAutoTUnref<SkPDFDevice> fDevice;
+    SkAutoTUnref<const SkPDFDevice> fDevice;
 
     // Once the content is finalized, put it into a stream for output.
     SkAutoTUnref<SkPDFStream> fContentStream;
     typedef SkPDFDict INHERITED;
 };
 
 #endif