Add OWNERS for camera folder

This CL adds OWNERS file into camera folder to clarify the ownership
which it should belongs to the same owners of Chrome Camera App.

Bug: 918091
Test: None
Change-Id: I447ce86bea6eb420ec98c9b6a387cb69a7368a4d
Reviewed-on: https://chromium-review.googlesource.com/c/1429301Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Wei Lee <wtlee@chromium.org>
Auto-Submit: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625276}

chrome/browser/resources/chromeos/camera/OWNERS

+set noparent
+
+henryhsu@chromium.org
+inker@chromium.org
+jcliang@chromium.org
+shenghao@chromium.org
+shik@chromium.org
+wtlee@chromium.org
+yuli@chromium.org