Make the file chooser use PP_ArrayOutput

ppapi/proxy/proxy_array_output.cc

Index: ppapi/proxy/proxy_array_output.cc
diff --git a/ppapi/proxy/proxy_array_output.cc b/ppapi/proxy/proxy_array_output.cc
new file mode 100644
index 0000000000000000000000000000000000000000..40a3c846e5be046f72e18c7a55d98cae9fbae2c3
--- /dev/null
+++ b/ppapi/proxy/proxy_array_output.cc
@@ -0,0 +1,21 @@
+// 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 "ppapi/proxy/proxy_array_output.h"
+
+#include "base/logging.h"
+
+namespace ppapi {
+namespace proxy {
+
+// static
+void* ArrayOutputAdapterBase::GetDataBufferThunk(void* user_data,
+                                                 uint32_t element_count,
+                                                 uint32_t element_size) {
+  return static_cast<ArrayOutputAdapterBase*>(user_data)->
+      GetDataBuffer(element_count, element_size);
+}
+
+}  // namespace proxy
+}  // namespace ppapi