Don't take a fake UGI every time we execute Javascript.

content/public/browser/render_frame_host.h

Index: content/public/browser/render_frame_host.h
diff --git a/content/public/browser/render_frame_host.h b/content/public/browser/render_frame_host.h
index dde20fe3831a0d74a1d7f7306ea1cc6748822f2b..25ad4d3cb0bee9018edef57fe9c2f4cc5738efb2 100644
--- a/content/public/browser/render_frame_host.h
+++ b/content/public/browser/render_frame_host.h
@@ -73,6 +73,10 @@ class CONTENT_EXPORT RenderFrameHost : public IPC::Listener,
   virtual void ExecuteJavaScript(const base::string16& javascript,
                                  const JavaScriptResultCallback& callback) = 0;
 
+  // ONLY FOR TESTS: Same as above but adds a fake UserGestureIndicator around
+  // execution. (crbug.com/408426)
+  virtual void ExecuteJavaScriptForTests(const base::string16& javascript) = 0;
+
   // Accessibility actions.
   virtual void AccessibilitySetFocus(int acc_obj_id) = 0;
   virtual void AccessibilityDoDefaultAction(int acc_obj_id) = 0;