android: Hide JNI exports by default.

android_webview/android_webview_tests.gypi

 # Copyright (c) 2012 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.
 {
   'targets': [
     {
       'target_name': 'android_webview_apk',
       'type': 'none',
       'dependencies': [
         'libstandalonelibwebviewchromium',
@@ skipping 181 matching lines @@
       'includes': [ '../build/apk_test.gypi' ],
     },
     {
       'target_name': 'libdrawgl',
       'type': 'shared_library',
       # Do not depend on any other component here, since this target
       # builds a separate shared library!
       'include_dirs': [
         '..',
       ],
+      'variables': {
+        # This library uses native JNI exports; tell gyp so that the required
+        # symbols will be kept.
+        'use_native_jni_exports': 1,
+      },
       'sources': [
           '../android_webview/test/shell/src/draw_gl/draw_gl.cc',
       ],
     },
     {
       'target_name': 'libstandalonelibwebviewchromium',
       'includes': [
         'libwebviewchromium.gypi',
       ],
     },
   ],
 }