Make rtc_base/base_java public.

Bug: webrtc:9048
Change-Id: I4ce8219fcc751ee89050a075df5ad44fc9e68237
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/144524
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28471}
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index a125040..0b68546 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -1370,6 +1370,7 @@
 
 if (is_android) {
   rtc_android_library("base_java") {
+    visibility = [ "*" ]
     java_files = [
       "java/src/org/webrtc/ContextUtils.java",
       "java/src/org/webrtc/Loggable.java",