Add PDFium build_overrides

build_overrides/pdfium.gni

Index: build_overrides/pdfium.gni
diff --git a/build_overrides/pdfium.gni b/build_overrides/pdfium.gni
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+# 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.
+
+# 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.

[Nico, 2016/04/27 19:38:02]

I think it'd be better to explain why Chromium chooses the value it chooses in
the comment, instead of repeating the variable name.

# Chromium ships with v8, so always use it for JavaScript in PDFs

ir some such (and similar for the others)

+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