diff --git chrome/browser/ui/views/frame/browser_frame_mac.h chrome/browser/ui/views/frame/browser_frame_mac.h
index a5ee05ae5f5e9..97fd2e8da450e 100644
--- chrome/browser/ui/views/frame/browser_frame_mac.h
+++ chrome/browser/ui/views/frame/browser_frame_mac.h
@@ -11,6 +11,7 @@
 #include "chrome/browser/command_observer.h"
 #include "ui/views/widget/native_widget_mac.h"
 
+class Browser;
 class BrowserFrame;
 class BrowserView;
 @class BrowserWindowTouchBarController;
@@ -54,6 +55,21 @@ class BrowserFrameMac : public views::NativeWidgetMac,
   bool ShouldUseInitialVisibleOnAllWorkspaces() const override;
   void AnnounceTextInInProcessWindow(const std::u16string& text) override;
 
+  static void ValidateUserInterfaceItem(
+      Browser* browser,
+      int32_t command,
+      remote_cocoa::mojom::ValidateUserInterfaceItemResult* result);
+  static bool WillExecuteCommand(
+      Browser* browser,
+      int32_t command,
+      WindowOpenDisposition window_open_disposition,
+      bool is_before_first_responder);
+  static bool ExecuteCommand(
+      Browser* browser,
+      int32_t command,
+      WindowOpenDisposition window_open_disposition,
+      bool is_before_first_responder);
+
  protected:
   ~BrowserFrameMac() override;
 
diff --git chrome/browser/ui/views/frame/browser_frame_mac.mm chrome/browser/ui/views/frame/browser_frame_mac.mm
index 65e7e391139ba..88dfa39f4cdcd 100644
--- chrome/browser/ui/views/frame/browser_frame_mac.mm
+++ chrome/browser/ui/views/frame/browser_frame_mac.mm
@@ -182,7 +182,14 @@ void BrowserFrameMac::OnWindowFullscreenTransitionComplete() {
 void BrowserFrameMac::ValidateUserInterfaceItem(
     int32_t tag,
     remote_cocoa::mojom::ValidateUserInterfaceItemResult* result) {
-  Browser* browser = browser_view_->browser();
+  return ValidateUserInterfaceItem(browser_view_->browser(), tag, result);
+}
+
+// static
+void BrowserFrameMac::ValidateUserInterfaceItem(
+    Browser* browser,
+    int32_t tag,
+    remote_cocoa::mojom::ValidateUserInterfaceItemResult* result) {
   if (!chrome::SupportsCommand(browser, tag)) {
     result->enable = false;
     return;
@@ -310,8 +317,16 @@ bool BrowserFrameMac::WillExecuteCommand(
     int32_t command,
     WindowOpenDisposition window_open_disposition,
     bool is_before_first_responder) {
-  Browser* browser = browser_view_->browser();
+  return WillExecuteCommand(browser_view_->browser(), command,
+                            window_open_disposition, is_before_first_responder);
+}
 
+// static
+bool BrowserFrameMac::WillExecuteCommand(
+    Browser* browser,
+    int32_t command,
+    WindowOpenDisposition window_open_disposition,
+    bool is_before_first_responder) {
   if (is_before_first_responder) {
     // The specification for this private extensions API is incredibly vague.
     // For now, we avoid triggering chrome commands prior to giving the
@@ -342,11 +357,20 @@ bool BrowserFrameMac::ExecuteCommand(
     int32_t command,
     WindowOpenDisposition window_open_disposition,
     bool is_before_first_responder) {
-  if (!WillExecuteCommand(command, window_open_disposition,
-                          is_before_first_responder))
-    return false;
+  return ExecuteCommand(browser_view_->browser(), command,
+                        window_open_disposition, is_before_first_responder);
+}
 
-  Browser* browser = browser_view_->browser();
+// static
+bool BrowserFrameMac::ExecuteCommand(
+    Browser* browser,
+    int32_t command,
+    WindowOpenDisposition window_open_disposition,
+    bool is_before_first_responder) {
+  if (!WillExecuteCommand(browser, command, window_open_disposition,
+                          is_before_first_responder)) {
+    return false;
+  }
 
   chrome::ExecuteCommandWithDisposition(browser, command,
                                         window_open_disposition);