Implement Custom Elements

sky/engine/core/dom/custom2/new_custom_element_callback_scope.cc

Index: sky/engine/core/dom/custom2/new_custom_element_callback_scope.cc
diff --git a/sky/engine/core/dom/custom2/new_custom_element_callback_scope.cc b/sky/engine/core/dom/custom2/new_custom_element_callback_scope.cc
new file mode 100644
index 0000000000000000000000000000000000000000..58fb3e97494c6a0c83ed8f42a4debbbdf6cdc287
--- /dev/null
+++ b/sky/engine/core/dom/custom2/new_custom_element_callback_scope.cc
@@ -0,0 +1,39 @@
+// Copyright 2015 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 "sky/engine/config.h"
+#include "sky/engine/core/dom/custom2/new_custom_element_callback_scope.h"
+
+#include "base/callback.h"
+
+namespace blink {
+namespace {
+static NewCustomElementCallbackScope* g_current = nullptr;
+}
+
+NewCustomElementCallbackScope::NewCustomElementCallbackScope()
+    : previous_scope_(g_current) {
+  g_current = this;
+}
+
+NewCustomElementCallbackScope::~NewCustomElementCallbackScope() {
+  while(!callbacks_.isEmpty()) {
+    Vector<base::Closure> local;
+    callbacks_.swap(local);
+    for (const auto& callback : local)
+      callback.Run();
+  }
+
+  g_current = previous_scope_;
+}
+
+NewCustomElementCallbackScope* NewCustomElementCallbackScope::Current() {
+  return g_current;
+}
+
+void NewCustomElementCallbackScope::Enqueue(const base::Closure& callback) {
+  callbacks_.append(callback);
+}
+
+}  // namespace blink