Pepper and WebKit API change to support a plugin knowing if a scrollbar is an overlay one.

ppapi/cpp/dev/resize_client_dev.cc

+// Copyright (c) 2011 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/resize_client_dev.h"
+
+#include "ppapi/c/dev/ppp_resize_dev.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/module_impl.h"
+
+namespace pp {
+
+namespace {
+
+// PPP_Resize_Dev --------------------------------------------------------------
+
+const char kPPPResizeInterface[] = PPP_RESIZE_DEV_INTERFACE;
+
+void WillStartLiveResize(PP_Instance instance) {
+  void* object =
+      pp::Instance::GetPerInstanceObject(instance, kPPPResizeInterface);
+  if (!object)
+    return;
+  return static_cast<ResizeClient_Dev*>(object)->WillStartLiveResize();
+}
+
+void WillEndLiveResize(PP_Instance instance) {
+  void* object =
+      pp::Instance::GetPerInstanceObject(instance, kPPPResizeInterface);
+  if (!object)
+    return;
+  return static_cast<ResizeClient_Dev*>(object)->WillEndLiveResize();
+}
+
+static PPP_Resize_Dev resize_interface = {
+  &WillStartLiveResize,
+  &WillEndLiveResize
+};
+
+}  // namespace
+
+ResizeClient_Dev::ResizeClient_Dev(Instance* instance)
+    : associated_instance_(instance) {
+  pp::Module::Get()->AddPluginInterface(kPPPResizeInterface, &resize_interface);
+  associated_instance_->AddPerInstanceObject(kPPPResizeInterface, this);
+}
+
+ResizeClient_Dev::~ResizeClient_Dev() {
+  associated_instance_->RemovePerInstanceObject(kPPPResizeInterface, this);
+}
+
+}  // namespace pp