Add constants for PDF 1.7 spec, table 7.2 and 7.3.

Add constants/transparency.h. The header lists constants from chapter 7
of the PDF spec.

BUG=pdfium:1049

Change-Id: I66bd6fceb24807eec9c308e2e47cec3f2f836ffb
Reviewed-on: https://pdfium-review.googlesource.com/32177
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index fc7c0eed8b..874a8f7d81 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -300,6 +300,7 @@ visibility = [
 source_set("constants") {
   sources = [
     "constants/stream_dict_common.h",
+    "constants/transparency.h",
   ]
 }