[content shell] don't require a user action for focus/blur events during layout tests

content/public/test/layouttest_support.h

Index: content/public/test/layouttest_support.h
diff --git a/content/public/test/layouttest_support.h b/content/public/test/layouttest_support.h
index 7548d1b7625914f0d5d4c4fcdbf863fdd9bd2ba0..6f7516da564fb98d629e4f2f26cce817dc224915 100644
--- a/content/public/test/layouttest_support.h
+++ b/content/public/test/layouttest_support.h
@@ -38,6 +38,9 @@ void EnableDevToolsFrontendTesting();
 // Returns the length of the local session history of a render view.
 int GetLocalSessionHistoryLength(RenderView* render_view);
 
+// Do not require a user gesture for focus change events.
+void DoNotRequireUserGestureForFocusChanges();
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_LAYOUTTEST_SUPPORT_H_