Allow overriding GN build flags

In order to enable XFA from GN builds we need to be able to override
pdf_enable_xfa. To do this a build_overrides/pdfium.gni file needs to be created
in Chrome. To use that, we have to create a build_overrides/pdfium.gni file
in PDFium that just uses the default values.

BUG=chromium:62400

Review-Url: https://codereview.chromium.org/1923333002

1 files changed, 23 insertions, 0 deletions

diff --git a/build_overrides/pdfium.gni b/build_overrides/pdfium.gni
new file mode 100644
index 0000000000..d032aa12a4
--- /dev/null
+++ b/build_overrides/pdfium.gni
@@ -0,0 +1,23 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This file contains PDFium-related build flags.
+
+declare_args() {
+  # On Android there's no system FreeType. On Windows and Mac, only a few
+  # methods are used from it.
+  pdfium_bundle_freetype = !is_linux
+
+  # Build PDFium either with or without v8 support.
+  pdf_enable_v8 = true
+
+  # Build PDFium either with or without XFA Forms support.
+  pdf_enable_xfa = false
+
+  # Build PDFium against skia (experimental) rather than agg.
+  pdf_use_skia = false
+
+  # Build PDFium standalone
+  pdf_is_standalone = false
+}