Add C++ wrappers for output parameters.

ppapi/cpp/array_output.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 "ppapi/cpp/array_output.h"
+
+#include "ppapi/cpp/logging.h"
+
+namespace pp {
+
+// 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);
+}
+
+VarArrayOutputAdapterWithStorage::VarArrayOutputAdapterWithStorage()
+    : ArrayOutputAdapter<PP_Var>() {
+  set_output(&temp_storage_);
+}
+
+void VarArrayOutputAdapterWithStorage::swap(
+    VarArrayOutputAdapterWithStorage& other) {
+  temp_storage_.swap(other.temp_storage_);
+  output_storage_.swap(other.output_storage_);
+}
+
+std::vector<Var>& VarArrayOutputAdapterWithStorage::output() {
+  PP_DCHECK(output_storage_.empty());
+
+  output_storage_.reserve(temp_storage_.size());
+  for (size_t i = 0; i < temp_storage_.size(); i++)
+    output_storage_.push_back(Var(PASS_REF, temp_storage_[i]));
+  temp_storage_.clear();
+  return output_storage_;
+}
+
+}  // namespace pp