Better error from pdfium_test when page too big to render.

samples/pdfium_test.cc

Index: samples/pdfium_test.cc
diff --git a/samples/pdfium_test.cc b/samples/pdfium_test.cc
index 068dbaa767b313ac1d6c62c2f039e10bc3627737..d473c4716a92bb2c17c0ac79a152c1c4674b62aa 100644
--- a/samples/pdfium_test.cc
+++ b/samples/pdfium_test.cc
@@ -505,6 +505,12 @@ void RenderPdf(const std::string& name, const char* pBuf, size_t len,
     int height = static_cast<int>(FPDF_GetPageHeight(page) * scale);
 
     FPDF_BITMAP bitmap = FPDFBitmap_Create(width, height, 0);
+    if (!bitmap) {
+      fprintf(stderr, "Page was too large to be rendered.\n");
+      bad_pages++;
+      continue;
+    }
+
     FPDFBitmap_FillRect(bitmap, 0, 0, width, height, 0xFFFFFFFF);
     FPDF_RenderPageBitmap(bitmap, page, 0, 0, width, height, 0, 0);
     rendered_pages ++;