Require a user gesture to display the PPAPI file chooser

webkit/plugins/ppapi/ppb_file_chooser_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/plugins/ppapi/ppb_file_chooser_impl.h"
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 129 matching lines @@
     return;
 
   callback_ = new TrackedCallback(this, callback);
 }
 
 void PPB_FileChooser_Impl::RunCallback(int32_t result) {
   TrackedCallback::ClearAndRun(&callback_, result);
 }
 
 int32_t PPB_FileChooser_Impl::Show(const PP_CompletionCallback& callback) {
+  PluginInstance* plugin_instance = ResourceHelper::GetPluginInstance(this);
+  if (!plugin_instance)
+    return PP_ERROR_FAILED;
+  if (!plugin_instance->IsProcessingUserGesture())
+    return PP_ERROR_NO_USER_GESTURE;
   return ShowWithoutUserGesture(false, NULL, callback);
 }
 
 int32_t PPB_FileChooser_Impl::ShowWithoutUserGesture(
     bool save_as,
     const char* suggested_file_name,
     const PP_CompletionCallback& callback) {
   int32_t rv = ValidateCallback(callback);
   if (rv != PP_OK)
     return rv;
@@ skipping 48 matching lines @@
       continue;
     StringToLowerASCII(&mime_type);
     normalized_mime_type_list.push_back(WebString::fromUTF8(mime_type.data(),
                                                             mime_type.size()));
   }
   return normalized_mime_type_list;
 }
 
 }  // namespace ppapi
 }  // namespace webkit