Reland of Android: Use linker script to hide all non-JNI symbols

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 73c49f41f783ec0ab4c9647891735072598a1f07..2d789333645cecaccc3f02887dbe956d70422796 100644
--- a/build/config/android/BUILD.gn
+++ b/build/config/android/BUILD.gn
@@ -195,17 +195,14 @@
   ldflags = [ "-pie" ]
 }
 
-config("hide_native_jni_exports") {
+config("hide_all_but_jni_onload") {
+  ldflags = [ "-Wl,--version-script=" + rebase_path(
+                  "//build/android/android_only_explicit_jni_exports.lst") ]
+}
+
+config("hide_all_but_jni") {
   ldflags = [ "-Wl,--version-script=" +
-              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/
+              rebase_path("//build/android/android_only_jni_exports.lst") ]
 }
 
 # Instrumentation -------------------------------------------------------------