[Extensions] Allow shared resources between tests via _test_resources

chrome/browser/extensions/extension_browsertest.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSERTEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSERTEST_H_
 
 #include <string>
 
 #include "base/command_line.h"
-
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
+#include "base/macros.h"
 #include "base/test/scoped_path_override.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/chrome_extension_test_notification_observer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/extension_host.h"
+#include "extensions/browser/extension_protocols.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/feature_switch.h"
 #include "extensions/common/features/feature_channel.h"
 #include "extensions/common/manifest.h"
 
 class ExtensionService;
 class Profile;
 
 namespace extensions {
@@ skipping 352 matching lines @@
   base::ScopedPathOverride user_quick_launch_override_;
   base::ScopedPathOverride start_menu_override_;
   base::ScopedPathOverride common_start_menu_override_;
 #endif
 
   // The default profile to be used.
   Profile* profile_;
 
   // Cache cache implementation.
   std::unique_ptr<extensions::ExtensionCacheFake> test_extension_cache_;
+
+  // An override so that chrome-extensions://<extension_id>/_test_resources/foo
+  // maps to chrome/test/data/extensions/foo.
+  extensions::ExtensionProtocolTestHandler test_protocol_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionBrowserTest);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSERTEST_H_