diff --git a/chrome/browser/extensions/BUILD.gn b/chrome/browser/extensions/BUILD.gn
index a8e054baadb1f..870b10ddd4eaa 100644
--- a/chrome/browser/extensions/BUILD.gn
+++ b/chrome/browser/extensions/BUILD.gn
@@ -351,6 +351,12 @@ source_set("extensions") {
     "external_install_manager.h",
     "external_install_manager_factory.cc",
     "external_install_manager_factory.h",
+    "//chrome/browser/browseros/extensions/browseros_extension_installer.cc",
+    "//chrome/browser/browseros/extensions/browseros_extension_installer.h",
+    "//chrome/browser/browseros/extensions/browseros_extension_loader.cc",
+    "//chrome/browser/browseros/extensions/browseros_extension_loader.h",
+    "//chrome/browser/browseros/extensions/browseros_extension_maintainer.cc",
+    "//chrome/browser/browseros/extensions/browseros_extension_maintainer.h",
     "external_loader.cc",
     "external_loader.h",
     "external_policy_loader.cc",
@@ -677,6 +683,18 @@ source_set("extensions") {
       "api/automation_internal/chrome_automation_internal_api_delegate.h",
       "api/bookmark_manager_private/bookmark_manager_private_api.cc",
       "api/bookmark_manager_private/bookmark_manager_private_api.h",
+      "api/browser_os/browser_os_api.cc",
+      "api/browser_os/browser_os_api.h",
+      "api/browser_os/browser_os_api_helpers.cc",
+      "api/browser_os/browser_os_api_helpers.h",
+      "api/browser_os/browser_os_api_utils.cc",
+      "api/browser_os/browser_os_api_utils.h",
+      "api/browser_os/browser_os_change_detector.cc",
+      "api/browser_os/browser_os_change_detector.h",
+      "api/browser_os/browser_os_content_processor.cc",
+      "api/browser_os/browser_os_content_processor.h",
+      "api/browser_os/browser_os_snapshot_processor.cc",
+      "api/browser_os/browser_os_snapshot_processor.h",
       "api/chrome_device_permissions_prompt.h",
       "api/developer_private/developer_private_event_router_desktop.cc",
       "api/developer_private/developer_private_event_router_desktop.h",
@@ -1006,6 +1024,8 @@ source_set("extensions") {
       "//components/language/core/common",
       "//components/language/core/language_model",
       "//components/live_caption:constants",
+      "//chrome/browser/browseros/core",
+      "//chrome/browser/browseros/metrics",
       "//components/media_device_salt",
       "//components/navigation_interception",
       "//components/net_log",
