Add READ_FACTORY_DATA permission to Android manifest.

Includes com.google.android.things.permission.READ_FACTORY_DATA in the
AndroidManifest.xml template. This permission is required by the
GetFactoryLocaleList() implementation in Cast on Android Things.

Bug: b/115985851
Test: Ensure no system errors involving READ_FACTORY_DATA

Change-Id: Ia4a281cee86f167911db13aa17156b59c346b086
Merge-With: eureka-internal/205878
Reviewed-on: https://chromium-review.googlesource.com/c/1259612
Commit-Queue: Akira Baruah <akirabaruah@chromium.org>
Reviewed-by: Simeon Anfinrud <sanfin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601329}

chromecast/browser/android/BUILD.gn

@@ -11,8 +11,10 @@ assert(is_android)
 cast_shell_android_manifest =
     "$root_gen_dir/cast_shell_manifest/AndroidManifest.xml"
 
-manifest_variables =
-    [ "cast_build_enable_background_activities=$enable_background_activities" ]
+manifest_variables = [
+  "cast_build_enable_background_activities=$enable_background_activities",
+  "is_android_things_non_public=$is_android_things_non_public",
+]
 
 jinja_template("cast_shell_manifest") {
   input = "apk/AndroidManifest.xml.jinja2"

chromecast/browser/android/apk/AndroidManifest.xml.jinja2

@@ -14,6 +14,11 @@
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
 
+    {% if is_android_things_non_public == "true" %}
+      <!-- CastSysInfoAndroidThings must read factory data. -->
+      <uses-permission android:name="com.google.android.things.permission.READ_FACTORY_DATA"/>
+    {% endif %}
+
     <application android:name="org.chromium.chromecast.shell.CastApplication"
                  android:icon="@mipmap/app_icon"
                  android:label="@string/app_name">