pdfviewer: add option to run the load or render multiple times, --benchLoad, --benchRender

experimental/PdfViewer/SkPdfRenderer.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkDevice.h"
 #include "SkForceLinking.h"
@@ skipping 1985 matching lines @@
 
     canvas->flush();
     return true;
 }
 
 bool SkPdfRenderer::load(const SkString inputFileName) {
     unload();
 
     // TODO(edisonn): create static function that could return NULL if there are errors
     fPdfDoc = new SkNativeParsedPDF(inputFileName.c_str());
+    if (fPdfDoc->pages() == 0) {
+        delete fPdfDoc;
+        fPdfDoc = NULL;
+    }
 
     return fPdfDoc != NULL;
 }
 
 int SkPdfRenderer::pages() const {
     return fPdfDoc != NULL ? fPdfDoc->pages() : 0;
 }
 
 void SkPdfRenderer::unload() {
     delete fPdfDoc;
     fPdfDoc = NULL;
 }
 
 SkRect SkPdfRenderer::MediaBox(int page) const {
     SkASSERT(fPdfDoc);
     return fPdfDoc->MediaBox(page);
 }
 
 size_t SkPdfRenderer::bytesUsed() const {
     return fPdfDoc ? fPdfDoc->bytesUsed() : 0;
 }
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