Extract NativeAppWindow from src/extensions

components/native_app_window/draggable_region.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 "components/native_app_window/draggable_region.h"
+
+#include "third_party/skia/include/core/SkRegion.h"
+
+namespace native_app_window {
+
+DraggableRegion::DraggableRegion() : draggable(false) {
+}
+
+SkRegion* RawDraggableRegionsToSkRegion(
+    const std::vector<DraggableRegion>& regions) {
+  SkRegion* sk_region = new SkRegion;
+  for (std::vector<DraggableRegion>::const_iterator iter = regions.begin();
+       iter != regions.end();
+       ++iter) {
+    const DraggableRegion& region = *iter;
+    sk_region->op(
+        region.bounds.x(),
+        region.bounds.y(),
+        region.bounds.right(),
+        region.bounds.bottom(),
+        region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
+  }
+  return sk_region;
+}
+
+}  // namespace native_app_window