Implement HiDPI support in Pepper dev interface

ppapi/cpp/dev/graphics_2d_dev.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/dev/graphics_2d_dev.h"
+
+#include "ppapi/c/dev/ppb_graphics_2d_dev.h"
+#include "ppapi/cpp/module_impl.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_Graphics2D_Dev>() {
+  return PPB_GRAPHICS2D_DEV_INTERFACE;
+}
+
+}  // namespace
+
+bool Graphics2DDev::SetScale(float scale) {
+  if (!has_interface<PPB_Graphics2D_Dev>())
+    return false;
+  return PP_ToBool(get_interface<PPB_Graphics2D_Dev>()->SetScale(pp_resource(),
+                                                                 scale));
+}
+
+float Graphics2DDev::GetScale() {
+  if (!has_interface<PPB_Graphics2D_Dev>())
+    return 1.0f;
+  return get_interface<PPB_Graphics2D_Dev>()->GetScale(pp_resource());
+}
+
+}  // namespace pp