Use a test specific macro to call JNI registrars during APK tests.

content/content_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': 'test_support_content',
       'type': 'static_library',
       'defines!': ['CONTENT_IMPLEMENTATION'],
@@ skipping 487 matching lines @@
           ],
         }, { # OS != "android"
           'dependencies': [
             '../third_party/libvpx/libvpx.gyp:libvpx',
           ],
         }],
         ['OS == "android" and gtest_target_type == "shared_library"', {
           'dependencies': [
             '../testing/android/native_test.gyp:native_test_native_code',
           ],
+          'defines': [
+            'REGISTER_CONTENT_UNITESTS_JNI',
+          ],
         }],
       ],
     },
     {
       'target_name': 'content_browsertests',
       'type': 'executable',
       'defines!': ['CONTENT_IMPLEMENTATION'],
       'dependencies': [
         'content_gpu',
         'content_plugin',
@@ skipping 152 matching lines @@
               '<(PRODUCT_DIR)/lib.java/chromium_base.jar',
               '<(PRODUCT_DIR)/lib.java/chromium_content.jar',
             ],
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }