PDF: Switch some unit tests to higher level API.

src/pdf/SkPDFBitmap.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 "SkColorPriv.h"
 #include "SkFlate.h"
 #include "SkPDFBitmap.h"
 #include "SkPDFCanon.h"
 #include "SkPDFCatalog.h"
-#include "SkPDFDocument.h"
 #include "SkStream.h"
 #include "SkUnPreMultiply.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 
 static void pdf_stream_begin(SkWStream* stream) {
     static const char streamBegin[] = " stream\n";
     stream->write(streamBegin, strlen(streamBegin));
 }
 
@@ skipping 284 matching lines @@
             return NULL;
         }
         // PDFAlphaBitmaps do not get directly canonicalized (they
         // are refed by the SkPDFBitmap).
         smask = SkNEW_ARGS(PDFAlphaBitmap, (bm));
     }
     pdfBitmap = SkNEW_ARGS(SkPDFBitmap, (bm, smask));
     canon->addBitmap(pdfBitmap);
     return pdfBitmap;
 }