Set the user gesture when executing script.

This is just like r145992 but for a different call site. If the script
executing creates a popup, we want the user gesture flag to be set correctly to
allow user-initiated popups.

BUG=130178

Review URL: https://chromiumcodereview.appspot.com/10827210

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150468 0039d316-1c4b-4281-b951-d872f2087c98

webkit/plugins/ppapi/ppapi_plugin_instance.cc

@@ -1844,8 +1844,15 @@ PP_Var PluginInstance::ExecuteScript(PP_Instance instance,
   }
 
   NPVariant result;
-  bool ok = WebBindings::evaluate(NULL, frame->windowObject(), &np_script,
-                                  &result);
+  bool ok = false;
+  if (IsProcessingUserGesture()) {
+    WebKit::WebScopedUserGesture user_gesture;
+    ok = WebBindings::evaluate(NULL, frame->windowObject(), &np_script,
+                               &result);
+  } else {
+    ok = WebBindings::evaluate(NULL, frame->windowObject(), &np_script,
+                               &result);
+  }
   if (!ok) {
     // TryCatch doesn't catch the exceptions properly. Since this is only for
     // a trusted API, just set to a general exception message.