resources: Prevent including the same resource in multiple pack files.

components/test/run_all_unittests.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/path_service.h"
 #include "base/test/launcher/unit_test_launcher.h"
@@ skipping 43 matching lines @@
 #endif
 
     ui::RegisterPathProvider();
 
     base::FilePath pak_path;
 #if defined(OS_ANDROID)
     PathService::Get(ui::DIR_RESOURCE_PAKS_ANDROID, &pak_path);
 #else
     PathService::Get(base::DIR_MODULE, &pak_path);
 #endif
-    ui::ResourceBundle::InitSharedInstanceWithPakPath(
-        pak_path.AppendASCII("components_tests_resources.pak"));
+
+    base::FilePath ui_test_pak_path;
+    ASSERT_TRUE(PathService::Get(ui::UI_TEST_PAK, &ui_test_pak_path));
+    ui::ResourceBundle::InitSharedInstanceWithPakPath(ui_test_pak_path);
+
+    ui::ResourceBundle::GetSharedInstance().AddDataPackFromPath(
+        pak_path.AppendASCII("components_tests_resources.pak"),
+        ui::SCALE_FACTOR_NONE);
 
     // These schemes need to be added globally to pass tests of
     // autocomplete_input_unittest.cc and content_settings_pattern*
     url::AddStandardScheme("chrome");
     url::AddStandardScheme("chrome-extension");
     url::AddStandardScheme("chrome-devtools");
     url::AddStandardScheme("chrome-search");
 
     // Not using kExtensionScheme to avoid the dependency to extensions.
     ContentSettingsPattern::SetNonWildcardDomainNonPortScheme(
@@ skipping 36 matching lines @@
   // The listener will set up common test environment for all components unit
   // tests.
   testing::TestEventListeners& listeners =
       testing::UnitTest::GetInstance()->listeners();
   listeners.Append(new ComponentsUnitTestEventListener());
 
   return base::LaunchUnitTests(
       argc, argv, base::Bind(&base::TestSuite::Run,
                              base::Unretained(&test_suite)));
 }