Define behaviors of FPDF_RenderPageBitmap_Retail and FPDF_FFLDraw.

samples/pdfium_test.cc

Index: samples/pdfium_test.cc
diff --git a/samples/pdfium_test.cc b/samples/pdfium_test.cc
index 421df39bf3cdfe30d56326dad52a585e444ea490..b78075e788c020992a3e231923811f59b5713ffb 100644
--- a/samples/pdfium_test.cc
+++ b/samples/pdfium_test.cc
@@ -573,9 +573,9 @@ bool RenderPage(const std::string& name,
   if (bitmap) {
     FPDF_DWORD fill_color = alpha ? 0x00000000 : 0xFFFFFFFF;
     FPDFBitmap_FillRect(bitmap, 0, 0, width, height, fill_color);
-    FPDF_RenderPageBitmap(bitmap, page, 0, 0, width, height, 0, 0);
+    FPDF_RenderPageBitmap(bitmap, page, 0, 0, width, height, 0, FPDF_ANNOT);
 
-    FPDF_FFLDraw(form, bitmap, page, 0, 0, width, height, 0, 0);
+    FPDF_FFLDraw(form, bitmap, page, 0, 0, width, height, 0, FPDF_ANNOT);
     int stride = FPDFBitmap_GetStride(bitmap);
     const char* buffer =
         reinterpret_cast<const char*>(FPDFBitmap_GetBuffer(bitmap));