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

content/public/test/browser_test_utils.cc

Index: content/public/test/browser_test_utils.cc
diff --git a/content/public/test/browser_test_utils.cc b/content/public/test/browser_test_utils.cc
index 61aa5f504ff156cc612c3aa413b3b7b0f197aacd..6ac4f13a9e79ed51e1c3ef7ff26c05d70e011fd0 100644
--- a/content/public/test/browser_test_utils.cc
+++ b/content/public/test/browser_test_utils.cc
@@ -408,6 +408,20 @@ void SimulateTapAt(WebContents* web_contents, const gfx::Point& point) {
   tap.type = blink::WebGestureEvent::GestureTap;
   tap.x = point.x();
   tap.y = point.y();
+  tap.modifiers = blink::WebInputEvent::ControlKey;
+  RenderWidgetHostImpl* widget_host =
+      RenderWidgetHostImpl::From(web_contents->GetRenderViewHost());
+  widget_host->ForwardGestureEvent(tap);
+}
+
+void SimulateTapWithModifiersAt(WebContents* web_contents,
+                                unsigned modifiers,
+                                const gfx::Point& point) {
+  blink::WebGestureEvent tap;
+  tap.type = blink::WebGestureEvent::GestureTap;
+  tap.x = point.x();
+  tap.y = point.y();
+  tap.modifiers = modifiers;
   RenderWidgetHostImpl* widget_host =
       RenderWidgetHostImpl::From(web_contents->GetRenderViewHost());
   widget_host->ForwardGestureEvent(tap);