Add a unittest for image_data_fetcher

components/BUILD.gn

 # Copyright 2014 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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 if (is_android) {
@@ skipping 68 matching lines @@
     "//components/device_event_log:unit_tests",
     "//components/dom_distiller/core:unit_tests",
     "//components/favicon/core:unit_tests",
     "//components/favicon_base:unit_tests",
     "//components/flags_ui:unit_tests",
     "//components/gcm_driver:unit_tests",
     "//components/gcm_driver/crypto:unit_tests",
     "//components/google/core/browser:unit_tests",
     "//components/history/core/browser:unit_tests",
     "//components/history/core/common:unit_tests",
+    "//components/image_fetcher:unit_tests",
     "//components/json_schema:unit_tests",
     "//components/keyed_service/core:unit_tests",
     "//components/language_usage_metrics:unit_tests",
     "//components/leveldb_proto:unit_tests",
     "//components/login:unit_tests",
     "//components/memory_pressure:unit_tests",
     "//components/metrics:unit_tests",
     "//components/mime_util:unit_tests",
     "//components/net_log:unit_tests",
     "//components/network_session_configurator:unit_tests",
@@ skipping 386 matching lines @@
       "//base/test:test_support_perf",
       "//components/scheduler",
       "//components/visitedlink/browser",
       "//content/test:test_support",
       "//testing/gtest",
       "//testing/perf",
       "//url",
     ]
   }
 }