Add //third_party/wuffs/config.gni

This creates a common place for current and future use_wuffs_xxx_parser
GN args.

Change-Id: I8e08522cab23a7bded2206f04cda916cca450b82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299688Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789407}

third_party/wuffs/BUILD.gn

@@ -28,6 +28,8 @@
 # targets' configuration or visibility, require consulting ENG_REVIEW_OWNERS,
 # as per the "adding_to_third_party.md" link above.
 
+import("//third_party/wuffs/config.gni")
+
 static_library("wuffs") {
   defines = [
     # Copy/pasting from "src/release/c/wuffs-*.c":
@@ -65,12 +67,17 @@ static_library("wuffs") {
     # ENG_REVIEW_OWNERS" comment at the top of this file.
     "WUFFS_CONFIG__MODULES",
     "WUFFS_CONFIG__MODULE__BASE__CORE",
-    "WUFFS_CONFIG__MODULE__BASE__INTERFACES",
-    "WUFFS_CONFIG__MODULE__BASE__PIXCONV",
-    "WUFFS_CONFIG__MODULE__GIF",
-    "WUFFS_CONFIG__MODULE__LZW",
   ]
 
+  if (use_wuffs_gif_parser) {
+    defines += [
+      "WUFFS_CONFIG__MODULE__BASE__INTERFACES",
+      "WUFFS_CONFIG__MODULE__BASE__PIXCONV",
+      "WUFFS_CONFIG__MODULE__GIF",
+      "WUFFS_CONFIG__MODULE__LZW",
+    ]
+  }
+
   # Do not modify this list without considering the "consult ENG_REVIEW_OWNERS"
   # comment at the top of this file.
   visibility = [ "//skia" ]

third_party/wuffs/config.gni

+# Copyright 2020 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.
+
+declare_args() {
+  use_wuffs_gif_parser = false
+}