Add a test for a simulated click on a link on tapping of gesture.

content/public/test/browser_test_utils.h

Index: content/public/test/browser_test_utils.h
diff --git a/content/public/test/browser_test_utils.h b/content/public/test/browser_test_utils.h
index 175becbd226e351dafffe003d49933f1a1f70dc3..a13df28a9c7de4ee8f0e8d7d126ba014d44d71c9 100644
--- a/content/public/test/browser_test_utils.h
+++ b/content/public/test/browser_test_utils.h
@@ -119,6 +119,11 @@ void SimulateMouseEvent(WebContents* web_contents,
 // Taps the screen at |point|.
 void SimulateTapAt(WebContents* web_contents, const gfx::Point& point);
 
+// Taps the screen with modifires at |point|.
+void SimulateTapWithModifiersAt(WebContents* web_contents,
+                                unsigned Modifiers,
+                                const gfx::Point& point);
+
 // Sends a key press asynchronously.
 // The native code of the key event will be set to InvalidNativeKeycode().
 // |key_code| alone is good enough for scenarios that only need the char