Android: Add no-op configs for hiding symbols by default

build/config/android/BUILD.gn

Index: build/config/android/BUILD.gn
diff --git a/build/config/android/BUILD.gn b/build/config/android/BUILD.gn
index 8b42a2ec0afe12f4e16b9d9724e2fb8bb81cc394..270003472e7cc2a6380db870e6af5c9b48a00e36 100644
--- a/build/config/android/BUILD.gn
+++ b/build/config/android/BUILD.gn
@@ -200,6 +200,14 @@ config("hide_native_jni_exports") {
               rebase_path("//build/android/android_no_jni_exports.lst") ]
 }
 
+config("hide_all_but_jni_onload") {
+  # TODO(agrieve): https://codereview.chromium.org/2633593004/
+}
+
+config("hide_all_but_jni") {
+  # TODO(agrieve): https://codereview.chromium.org/2633593004/
+}
+
 # Instrumentation -------------------------------------------------------------
 #
 # The BUILDCONFIG file sets the "default_cygprofile_instrumentation" config on