Hardcode extensions::util::IsNewBookmarkAppsEnabled() to true, except on Mac.

chrome/browser/apps/app_shim/app_shim_interactive_uitest_mac.mm

 // 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 <Cocoa/Cocoa.h>
 #include <vector>
 
 #include "apps/app_lifetime_monitor_factory.h"
 #include "apps/switches.h"
 #include "base/auto_reset.h"
@@ skipping 10 matching lines @@
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "chrome/browser/apps/app_shim/app_shim_handler_mac.h"
 #include "chrome/browser/apps/app_shim/app_shim_host_manager_mac.h"
 #include "chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/launch_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/web_applications/web_app_mac.h"
+#include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_paths.h"
-#include "chrome/common/chrome_switches.h"
 #include "chrome/common/mac/app_mode_common.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/test/test_utils.h"
 #include "extensions/browser/app_window/native_app_window.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/test/extension_test_message_listener.h"
 #import "ui/base/test/windowed_nsnotification_observer.h"
 #import "ui/events/test/cocoa_test_event_utils.h"
 
 namespace {
 
 // General end-to-end test for app shims.
 class AppShimInteractiveTest : public extensions::PlatformAppBrowserTest {
  protected:
   // Type of app to install, when invoking InstallAppWithShim().
   enum AppType { APP_TYPE_PACKAGED, APP_TYPE_HOSTED };
 
   AppShimInteractiveTest()
       : auto_reset_(&g_app_shims_allow_update_and_launch_in_tests, true) {}
 
   // Install a test app of |type| and reliably wait for its app shim to be
   // created on disk. Sets |shim_path_|.
   const extensions::Extension* InstallAppWithShim(AppType type,
                                                   const char* name);
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
     PlatformAppBrowserTest::SetUpCommandLine(command_line);
-    command_line->AppendSwitch(switches::kEnableNewBookmarkApps);
+    command_line->AppendSwitchASCII(switches::kEnableFeatures,

[dominickn, 2017/03/22 04:18:12]

Can you carry a base::ScopedFeatureList as a member on this class, and
initialize it in the setup with features::kBookmarkApps? Not sure if there's a
weird restriction here that means you can't use it.

[tapted, 2017/03/23 02:59:58]

Done.

+                                    features::kBookmarkApps.name);
   }
 
  protected:
   base::FilePath shim_path_;
 
  private:
   // Temporarily enable app shims.
   base::AutoReset<bool> auto_reset_;
 
   DISALLOW_COPY_AND_ASSIGN(AppShimInteractiveTest);
@@ skipping 548 matching lines @@
   // the shim is rebuilt.
   WindowedAppShimLaunchObserver(app->id()).Wait();
 
   EXPECT_TRUE(GetFirstAppWindow());
   EXPECT_TRUE(HasAppShimHost(profile(), app->id()));
 }
 
 #endif  // defined(ARCH_CPU_64_BITS)
 
 }  // namespace apps