Set is_test_apk=1 for content_browsertests_apk.

content/content_tests.gypi

 # Copyright (c) 2013 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 1273 matching lines @@
             'content_java_test_support',
             'content_shell_java',
           ],
           'variables': {
             'apk_name': 'content_browsertests',
             'java_in_dir': 'shell/android/browsertests_apk',
             'resource_dir': 'shell/android/browsertests_apk/res',
             'native_lib_target': 'libcontent_browsertests',
             'additional_input_paths': ['<(PRODUCT_DIR)/content_shell/assets/content_shell.pak'],
             'asset_location': '<(ant_build_out)/content_shell/assets',
+            'is_test_apk': 1,
           },
           'includes': [ '../build/java_apk.gypi' ],
         },
         {
           'target_name': 'video_decode_accelerator_unittest_apk',
           'type': 'none',
           'dependencies': [
             'video_decode_accelerator_unittest',
           ],
           'variables': {
@@ skipping 201 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }