Temporarily re-add content/renderer/input/OWNERS

When content/renderer/input was moved[1] it removed the OWNERS file. However
content/renderer/android/OWNERS lists it as a dependency.

This leads to any changes to content/renderer/android to fail presubmit, due to
the missing file. This includes changes to remove that dependency in the OWNERS.

This change temporarily re-adds the file so that the dependency can be removed.

Removing the dependency will be done in a follow-up[2]. After which this change will be reverted.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2411941
[2] https://chromium-review.googlesource.com/c/chromium/src/+/2422181/

Bug: 1097816
Change-Id: Ic318ebdd5c9e845afb6047776a2b9ebb0b5d746a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422141Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809307}

content/renderer/input/OWNERS

+# TODO(jonross): delete this once the dependency in content/renderer/android
+# has been removed. Without this presubmit fails.
+
+dtapuska@chromium.org
+tdresser@chromium.org
+nzolghadr@chromium.org
+
+# TEAM: input-dev@chromium.org
+# COMPONENT: Blink>Input