[Chromecast] Add android OWNERS.

This wil help Chromium reviewers target the right folks for Android
changes more quickly.

BUG=

Change-Id: I9ddabaafe79074202560bf02df7911abe47b19a9
Reviewed-on: https://chromium-review.googlesource.com/1059582
Commit-Queue: Stephen Lanham <slan@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558771}

chromecast/OWNERS

@@ -2,6 +2,10 @@ halliwell@chromium.org
 servolk@chromium.org
 slan@chromium.org
 
+# Android
+per-file *android*=file://chromecast/android/OWNERS
+per-file *.java=file://chromecast/android/OWNERS
+
 # For major changes, please use one of the reviewers above!
 alexst@chromium.org
 spang@chromium.org

chromecast/android/OWNERS

+sanfin@chromium.org
+
+# COMPONENT: Chromecast

chromecast/app/android/OWNERS

+file://chromecast/android/OWNERS
+
+# COMPONENT: Chromecast

chromecast/base/android/OWNERS

+file://chromecast/android/OWNERS
+
+# COMPONENT: Chromecast