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

android_webview/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//android_webview/system_webview_apk_tmpl.gni")
 import("//android_webview/webview_repack_locales.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/config/locales.gni")
 import("//components/spellcheck/spellcheck_build_features.gni")
@@ skipping 294 matching lines @@
   ]
   sources = [
     "lib/main/webview_entry_point.cc",
   ]
 }
 
 shared_library("libwebviewchromium") {
   deps = [
     ":webview_entry_point",
   ]
-  configs -= [ "//build/config/android:hide_native_jni_exports" ]
+  configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
+  configs += [ "//build/config/android:hide_all_but_jni" ]
 }
 
 if (android_64bit_target_cpu) {
   android_assets("v8_snapshot_secondary_abi_assets") {
     _secondary_abi_out_dir =
         get_label_info("//v8($android_secondary_abi_toolchain)", "root_out_dir")
     assert(android_64bit_target_cpu,
            "32-bit targets shouldn't have secondary abi")
     arch_suffix = "32"
     renaming_sources = [ "$_secondary_abi_out_dir/snapshot_blob.bin" ]
     renaming_destinations = [ "snapshot_blob_$arch_suffix.bin" ]
     disable_compression = true
     deps = [
       "//v8($android_secondary_abi_toolchain)",
     ]
   }
 
   shared_library("monochrome") {
     deps = [
       ":webview_entry_point",
     ]
-    configs -= [ "//build/config/android:hide_native_jni_exports" ]
+    configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
+    configs += [ "//build/config/android:hide_all_but_jni" ]
   }
 }
 
 if (enable_resource_whitelist_generation) {
   generate_resource_whitelist("system_webview_pak_whitelist") {
     deps = [
       ":libwebviewchromium",
     ]
     input = "$root_out_dir/libwebviewchromium$shlib_extension.whitelist"
     output = system_webview_pak_whitelist
@@ skipping 449 matching lines @@
   system_webview_apk_tmpl("system_webview_apk") {
     android_manifest = system_webview_android_manifest
     android_manifest_dep = ":system_webview_manifest"
     deps = [
       ":system_webview_resources",
       "//android_webview/glue",
     ]
     apk_name = "SystemWebView"
   }
 }