Propagate scrolling/marginwidth/marginheight property values to child frame.

third_party/WebKit/public/web/WebFrameOwnerProperties.h

+// 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.
+
+#ifndef WebFrameOwnerProperties_h
+#define WebFrameOwnerProperties_h
+
+namespace blink {
+
+struct WebFrameOwnerProperties {
+    enum class ScrollingMode {
+        Auto,
+        AlwaysOff,
+        AlwaysOn,
+        Last = AlwaysOn
+    };
+
+    ScrollingMode scrollingMode;
+    int marginWidth;
+    int marginHeight;
+
+    WebFrameOwnerProperties()
+        : scrollingMode(ScrollingMode::Auto)
+        , marginWidth(-1)
+        , marginHeight(-1)
+    {
+    }
+
+    WebFrameOwnerProperties(ScrollingMode scrollingMode, int marginWidth, int marginHeight)
+        : scrollingMode(scrollingMode)
+        , marginWidth(marginWidth)
+        , marginHeight(marginHeight)
+    {
+    }
+
+#if INSIDE_BLINK
+    WebFrameOwnerProperties(ScrollbarMode scrollingMode, int marginWidth, int marginHeight)
+        : WebFrameOwnerProperties(static_cast<ScrollingMode>(scrollingMode), marginWidth, marginHeight)

[dcheng, 2015/10/14 07:20:43]

I don't think anyone else actually calls this constructor. So we should just
merge the initializer list of this overload directly inside the
BLINK_IMPLEMENTATION block.

[lazyboy, 2015/10/14 20:05:30]

Done.

+    {
+    }
+#endif
+};
+
+} // namespace blink
+
+#endif