[Mac] Add interactive App Shim test.

chrome/browser/web_applications/web_app_mac.mm

Index: chrome/browser/web_applications/web_app_mac.mm
diff --git a/chrome/browser/web_applications/web_app_mac.mm b/chrome/browser/web_applications/web_app_mac.mm
index 7bfa3d339bf2b0d13df6506eaca7a9e4125ea944..b46170c3685b58b879ae910c3d5b45e1dfc422c8 100644
--- a/chrome/browser/web_applications/web_app_mac.mm
+++ b/chrome/browser/web_applications/web_app_mac.mm
@@ -47,6 +47,8 @@
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image_family.h"
 
+bool g_app_shims_allow_update_and_launch_in_tests = false;
+
 namespace {
 
 // Launch Services Key to run as an agent app, which doesn't launch in the dock.
@@ -564,7 +566,11 @@ size_t WebAppShortcutCreator::CreateShortcutsIn(
       return succeeded;
     }
 
+    // Remove the quarantine attribute from both the bundle and the executable.
     base::mac::RemoveQuarantineAttribute(dst_path.Append(app_name));
+    base::mac::RemoveQuarantineAttribute(
+        dst_path.Append(app_name)
+            .Append("Contents").Append("MacOS").Append("app_mode_loader"));
     ++succeeded;
   }
 
@@ -863,8 +869,10 @@ base::FilePath GetAppInstallPath(const ShortcutInfo& shortcut_info) {
 }
 
 void MaybeLaunchShortcut(const ShortcutInfo& shortcut_info) {
-  if (AppShimsDisabledForTest())
+  if (AppShimsDisabledForTest() &&
+      !g_app_shims_allow_update_and_launch_in_tests) {
     return;
+  }
 
   content::BrowserThread::PostTask(
       content::BrowserThread::FILE, FROM_HERE,
@@ -976,8 +984,10 @@ void UpdatePlatformShortcuts(
     const ShortcutInfo& shortcut_info,
     const extensions::FileHandlersInfo& file_handlers_info) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
-  if (AppShimsDisabledForTest())
+  if (AppShimsDisabledForTest() &&
+      !g_app_shims_allow_update_and_launch_in_tests) {
     return;
+  }
 
   WebAppShortcutCreator shortcut_creator(
       app_data_path, shortcut_info, file_handlers_info);