Introduce ui_test_utils::FocusView and de-flake OmniboxViewTest.BeginningShownAfterBlur

chrome/test/base/interactive_test_utils.h

Index: chrome/test/base/interactive_test_utils.h
diff --git a/chrome/test/base/interactive_test_utils.h b/chrome/test/base/interactive_test_utils.h
index 0779a4f862ee70467c3f352982af822ccdbbb355..e8c7a224b16fb61f8d4c12931634602e3f5f5573 100644
--- a/chrome/test/base/interactive_test_utils.h
+++ b/chrome/test/base/interactive_test_utils.h
@@ -31,6 +31,9 @@ bool IsViewFocused(const Browser* browser, ViewID vid);
 // Simulates a mouse click on a View in the browser.
 void ClickOnView(const Browser* browser, ViewID vid);
 
+// Makes focus shift to the given View without clicking it.
+void FocusView(const Browser* browser, ViewID vid);
+
 // A collection of utilities that are used from interactive_ui_tests. These are
 // separated from ui_test_utils.h to ensure that browser_tests don't use them,
 // since they depend on focus which isn't possible for sharded test.