[reland] Bring up BrowserActionInteractiveTest on Mac.

chrome/browser/extensions/browser_action_test_util.h

Index: chrome/browser/extensions/browser_action_test_util.h
diff --git a/chrome/browser/extensions/browser_action_test_util.h b/chrome/browser/extensions/browser_action_test_util.h
index 4bdeedf2f74f7248c5ed7e5c4d3b1e4f75a5c9d2..cf90784a83ee9e99e75897964df905a574b9a210 100644
--- a/chrome/browser/extensions/browser_action_test_util.h
+++ b/chrome/browser/extensions/browser_action_test_util.h
@@ -69,6 +69,10 @@ class BrowserActionTestUtil {
 
   gfx::NativeView GetPopupNativeView();
 
+  // Spins a RunLoop until the NativeWindow hosting |GetPopupNativeView()| is
+  // reported as active by the OS. Returns true if successful.
+  bool WaitForPopup();
+
   // Returns whether a browser action popup is being shown currently.
   bool HasPopup();