Do IWYU for progressivedecoder.h.

Otherwise it won't compile when all the codecs are turned off. Also fix
a typo in pdfium.gni while testing turning off codecs.

Change-Id: I3bbc2589e6074b0bde464dfc5364f03be3c620cf
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/69953
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
diff --git a/core/fxcodec/progressivedecoder.h b/core/fxcodec/progressivedecoder.h
index 30cb73c..10debd1 100644
--- a/core/fxcodec/progressivedecoder.h
+++ b/core/fxcodec/progressivedecoder.h
@@ -13,6 +13,7 @@
 
 #include "core/fxcodec/fx_codec_def.h"
 #include "core/fxcodec/jpeg/jpegmodule.h"
+#include "core/fxcodec/progressive_decoder_iface.h"
 #include "core/fxcrt/fx_memory_wrappers.h"
 #include "core/fxcrt/fx_system.h"
 #include "core/fxcrt/retain_ptr.h"
diff --git a/pdfium.gni b/pdfium.gni
index 00a3886..5032de0 100644
--- a/pdfium.gni
+++ b/pdfium.gni
@@ -33,7 +33,7 @@
   # If XFA, also support png codec. Ignored if not XFA.
   pdf_enable_xfa_png = true
 
-  # If XFA, also support png codec. Ignored if not XFA.
+  # If XFA, also support tiff codec. Ignored if not XFA.
   pdf_enable_xfa_tiff = true
 
   # Build PDFium against Skia (experimental) rather than AGG. Use Skia to draw