Enable jumbo for media/filters

Building //media takes around 23 CPU minutes. A experimental
branch showed that this could be reduced, by using jumbo,
to around 9 CPU minutes. media/filters is the third largest part
of media and takes around 2 CPU minutes to compile without
jumbo.

This commit enables jumbo for media/filters.

Bug: 867350
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I01fe34fb39b35bf1a95e893916c2fc49e59a6d9e
Reviewed-on: https://chromium-review.googlesource.com/1152808
Reviewed-by: Chrome Cunningham (In Paris) <chcunningham@chromium.org>
Commit-Queue: Chrome Cunningham (In Paris) <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578608}
diff --git a/media/filters/BUILD.gn b/media/filters/BUILD.gn
index 72ac8bd..f8ea4da 100644
--- a/media/filters/BUILD.gn
+++ b/media/filters/BUILD.gn
@@ -2,10 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/jumbo.gni")
 import("//media/media_options.gni")
 import("//third_party/libaom/options.gni")
 
-source_set("filters") {
+jumbo_source_set("filters") {
   # Do not expand the visibility here without double-checking with OWNERS, this
   # is a roll-up target which is part of the //media component. Most other DEPs
   # should be using //media and not directly DEP this roll-up target.