Add constants for PDF 1.7 spec, table 8.15.

BUG=pdfium:1049

Change-Id: I09fb1c34b8f08ce5c5b5f86e7fe64dfd11ed770d
Reviewed-on: https://pdfium-review.googlesource.com/c/49571
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/constants/BUILD.gn b/constants/BUILD.gn
index 25a574e..cdfd665 100644
--- a/constants/BUILD.gn
+++ b/constants/BUILD.gn
@@ -7,6 +7,7 @@
 
 jumbo_source_set("constants") {
   sources = [
+    "annotation_common.h",
     "form_flags.h",
     "page_object.h",
     "stream_dict_common.h",