blink: Make WebMainThreadScrollingReason wrap the cc enum.

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ScrollingCoordinator_h
 #define ScrollingCoordinator_h
 
 #include "core/CoreExport.h"
 #include "core/layout/LayoutObject.h"
 #include "platform/PlatformWheelEvent.h"
 #include "platform/geometry/IntRect.h"
+#include "platform/scroll/MainThreadScrollingReason.h"
 #include "platform/scroll/ScrollTypes.h"
-#include "public/platform/WebMainThreadScrollingReason.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 class WebScrollbarLayer;
 }
 
 namespace blink {
 
 typedef unsigned MainThreadScrollingReasons;
@@ skipping 88 matching lines @@
     RawPtrWillBeMember<Page> m_page;
 
     // Dirty flags used to idenfity what really needs to be computed after compositing is updated.
     bool m_scrollGestureRegionIsDirty;
     bool m_touchEventTargetRectsAreDirty;
     bool m_shouldScrollOnMainThreadDirty;
 
 private:
     bool shouldUpdateAfterCompositingChange() const { return m_scrollGestureRegionIsDirty || m_touchEventTargetRectsAreDirty || m_shouldScrollOnMainThreadDirty || frameViewIsDirty(); }
 
-    void setShouldUpdateScrollLayerPositionOnMainThread(MainThreadScrollingReasons);
+    void setShouldUpdateScrollLayerPositionOnMainThread(uint32_t mainThreadScrollingReasons);
 
     bool hasVisibleSlowRepaintViewportConstrainedObjects(FrameView*) const;
 
     void setShouldHandleScrollGestureOnMainThreadRegion(const Region&);
     void setTouchEventTargetRects(LayerHitTestRects&);
     void computeTouchEventTargetRects(LayerHitTestRects&);
 
     WebScrollbarLayer* addWebScrollbarLayer(ScrollableArea*, ScrollbarOrientation, PassOwnPtr<WebScrollbarLayer>);
     WebScrollbarLayer* getWebScrollbarLayer(ScrollableArea*, ScrollbarOrientation);
     void removeWebScrollbarLayer(ScrollableArea*, ScrollbarOrientation);
 
     bool frameViewIsDirty() const;
 
     OwnPtr<WebCompositorAnimationTimeline> m_programmaticScrollAnimatorTimeline;
 
     using ScrollbarMap = WillBeHeapHashMap<RawPtrWillBeMember<ScrollableArea>, OwnPtr<WebScrollbarLayer>>;
     ScrollbarMap m_horizontalScrollbars;
     ScrollbarMap m_verticalScrollbars;
     HashSet<const PaintLayer*> m_layersWithTouchRects;
     bool m_wasFrameScrollable;
 
-    MainThreadScrollingReasons m_lastMainThreadScrollingReasons;
+    uint32_t m_lastMainThreadScrollingReasons;

[esprehn, 2016/01/20 00:09:56]

we often do // ActualType

in a comment so you know where to look to see what values are possible.

[danakj, 2016/01/20 00:15:11]

Done. "A set of flags from MainThreadScrollingReasons"

[danakj, 2016/01/20 22:38:07]

Actually I found there is a MainThreadScrollingReasons typedef at the top of
this file, using that.

 };
 
 } // namespace blink
 
 #endif // ScrollingCoordinator_h