Bug 794407 - Web Activites should only be started by a user interaction. r=fabrice a=blocking-basecamp

dom/activities/src/Activity.cpp

@@ -6,6 +6,7 @@
 #include "nsDOMClassInfo.h"
 #include "nsContentUtils.h"
 #include "nsIDOMActivityOptions.h"
+#include "nsEventStateManager.h"
 
 using namespace mozilla::dom;
 
@@ -47,6 +48,14 @@ Activity::Initialize(nsISupports* aOwner,
 
   Init(window);
 
+  if (!nsEventStateManager::IsHandlingUserInput()) {
+    nsCOMPtr<nsIDOMRequestService> rs =
+      do_GetService("@mozilla.org/dom/dom-request-service;1");
+    rs->FireErrorAsync(static_cast<DOMRequest*>(this),
+                       NS_LITERAL_STRING("NotUserInput"));
+    return NS_OK;
+  }
+
   // We expect a single argument, which is a nsIDOMMozActivityOptions.
   if (aArgc != 1 || !aArgv[0].isObject()) {
     return NS_ERROR_INVALID_ARG;