Implement HiDPI support in Pepper dev interface

ppapi/cpp/private/view_private.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/private/view_private.h"
+
+#include "ppapi/c/private/ppb_view_private.h"
+#include "ppapi/cpp/module_impl.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_View_Private>() {
+  return PPB_VIEW_PRIVATE_INTERFACE;
+}
+
+}  // namespace
+
+float ViewPrivate::GetDeviceScale() const {
+  if (has_interface<PPB_View_Private>()) {
+    float out;
+    if (PP_ToBool(get_interface<PPB_View_Private>()->GetDeviceScale(
+        pp_resource(), &out)))
+      return out;
+  }
+  return 1.0f;
+}
+
+float ViewPrivate::GetCSSScale() const {
+  if (has_interface<PPB_View_Private>()) {
+    float out;
+    if (PP_ToBool(get_interface<PPB_View_Private>()->GetCSSScale(
+        pp_resource(), &out)))
+      return out;
+  }
+  return 1.0f;
+}
+
+}  // namespace pp