Added a method to detect all supported "image/*" MIME types

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.
 
 {
   'variables': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 618 matching lines @@
         'browser/webui/web_ui_data_source_unittest.cc',
         'browser/webui/web_ui_message_handler_unittest.cc',
         'child/blink_platform_impl_unittest.cc',
         'child/fileapi/webfilewriter_base_unittest.cc',
         'child/indexed_db/indexed_db_dispatcher_unittest.cc',
         'child/indexed_db/webidbcursor_impl_unittest.cc',
         'child/multipart_response_delegate_unittest.cc',
         'child/npapi/plugin_lib_unittest.cc',
         'child/power_monitor_broadcast_source_unittest.cc',
         'child/resource_dispatcher_unittest.cc',
+        'child/simple_webmimeregistry_impl_unittest.cc',
         'child/site_isolation_policy_unittest.cc',
         'child/touch_fling_gesture_curve_unittest.cc',
         'child/web_url_loader_impl_unittest.cc',
         'child/webcrypto/shared_crypto_unittest.cc',
         'child/worker_task_runner_unittest.cc',
         'common/android/address_parser_unittest.cc',
         'common/android/gin_java_bridge_value_unittest.cc',
         'common/cc_messages_unittest.cc',
         'common/common_param_traits_unittest.cc',
         'common/cursors/webcursor_unittest.cc',
@@ skipping 1216 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }