core: allow building against system zlib
In a way similar to the existing USE_SYSTEM_LIBJPEG. The default is of
course still the DEPS-based zlib checkout.
Changes in v2:
1) Since Chromium doesn't have //third_party:zlib (AKA a "zlib" target in
//third_party/BUILD.GN) all the targets that depended on //third_party:zlib now
depend on third_party:zlib, which always points to PDFium's
third_party/BUILD.GN. The targets that depended on //third_party:zlib in
third_party/BUILD.GN just depend on :zlib instead.
2) Move the zlib bits out of !build_with_chromium block.
Change-Id: Id73eb07591418ff2ae71b83b87c18af71b49a22a
Reviewed-on: https://pdfium-review.googlesource.com/5030
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/skia/BUILD.gn b/skia/BUILD.gn
index 0760246..9f60fcd 100644
--- a/skia/BUILD.gn
+++ b/skia/BUILD.gn
@@ -317,8 +317,8 @@
deps = [
":skia_opts",
+ "../third_party:zlib",
"//:freetype_common",
- "//third_party/zlib:zlib",
]
if (is_linux) {
