Initial scroll-blocks-on compositor integration

public/platform/WebScrollBlocksOn.h

+// Copyright 2014 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 WebScrollBlocksOn_h
+#define WebScrollBlocksOn_h
+
+#include "WebCommon.h"
+
+namespace blink {
+
+enum WebScrollBlocksOn {
+    WebScrollBlocksOnNone = 0x0,
+    WebScrollBlocksOnStartTouch = 0x1,
+    WebScrollBlocksOnWheelEvent = 0x2,
+    WebScrollBlocksOnScrollEvent = 0x4,
+};
+inline WebScrollBlocksOn operator| (WebScrollBlocksOn a, WebScrollBlocksOn b) { return WebScrollBlocksOn(int(a) | int(b)); }
+inline WebScrollBlocksOn& operator|= (WebScrollBlocksOn& a, WebScrollBlocksOn b) { return a = a | b; }
+inline WebScrollBlocksOn operator& (WebScrollBlocksOn a, WebScrollBlocksOn b) { return WebScrollBlocksOn(int(a) & int(b)); }
+inline WebScrollBlocksOn& operator&= (WebScrollBlocksOn& a, WebScrollBlocksOn b) { return a = a & b; }
+
+} // namespace blink
+
+#endif