Fold ScrollingCoordinatorChromium into ScrollingCoordinator and devirtualize

Source/WebCore/page/scrolling/ScrollingTree.h

Index: Source/WebCore/page/scrolling/ScrollingTree.h
diff --git a/Source/WebCore/page/scrolling/ScrollingTree.h b/Source/WebCore/page/scrolling/ScrollingTree.h
deleted file mode 100644
index ad7bceb229cc241a1775a15006de9646876ded31..0000000000000000000000000000000000000000
--- a/Source/WebCore/page/scrolling/ScrollingTree.h
+++ /dev/null
@@ -1,149 +0,0 @@
-/*
- * Copyright (C) 2012, 2013 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
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
- * THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef ScrollingTree_h
-#define ScrollingTree_h
-
-#if ENABLE(THREADED_SCROLLING)
-
-#include "PlatformWheelEvent.h"
-#include "Region.h"
-#include "ScrollingCoordinator.h"
-#include <wtf/Functional.h>
-#include <wtf/HashMap.h>
-#include <wtf/OwnPtr.h>
-#include <wtf/PassOwnPtr.h>
-#include <wtf/PassRefPtr.h>
-#include <wtf/RefPtr.h>
-#include <wtf/ThreadSafeRefCounted.h>
-
-#if PLATFORM(MAC)
-#include <wtf/RetainPtr.h>
-OBJC_CLASS CALayer;
-#endif
-
-namespace WebCore {
-
-class IntPoint;
-class ScrollingStateNode;
-class ScrollingStateTree;
-class ScrollingTreeNode;
-class ScrollingTreeScrollingNode;
-
-// The ScrollingTree class lives almost exclusively on the scrolling thread and manages the
-// hierarchy of scrollable regions on the page. It's also responsible for dispatching events
-// to the correct scrolling tree nodes or dispatching events back to the ScrollingCoordinator
-// object on the main thread if they can't be handled on the scrolling thread for various reasons.
-class ScrollingTree : public ThreadSafeRefCounted<ScrollingTree> {
-public:
-    static PassRefPtr<ScrollingTree> create(ScrollingCoordinator*);
-    ~ScrollingTree();
-
-    enum EventResult {
-        DidNotHandleEvent,
-        DidHandleEvent,
-        SendToMainThread
-    };
-
-    // Can be called from any thread. Will try to handle the wheel event on the scrolling thread.
-    // Returns true if the wheel event can be handled on the scrolling thread and false if the
-    // event must be sent again to the WebCore event handler.
-    EventResult tryToHandleWheelEvent(const PlatformWheelEvent&);
-    bool hasWheelEventHandlers() const { return m_hasWheelEventHandlers; }
-
-    // Can be called from any thread. Will update the back forward state of the page, used for rubber-banding.
-    void updateBackForwardState(bool canGoBack, bool canGoForward);
-
-    // Must be called from the scrolling thread. Handles the wheel event.
-    void handleWheelEvent(const PlatformWheelEvent&);
-
-    void setMainFrameIsRubberBanding(bool);
-    bool isRubberBandInProgress();
-
-    void invalidate();
-    void commitNewTreeState(PassOwnPtr<ScrollingStateTree>);
-
-    void setMainFramePinState(bool pinnedToTheLeft, bool pinnedToTheRight, bool pinnedToTheTop, bool pinnedToTheBottom);
-
-    void updateMainFrameScrollPosition(const IntPoint& scrollPosition, SetOrSyncScrollingLayerPosition = SyncScrollingLayerPosition);
-    IntPoint mainFrameScrollPosition();
-
-#if PLATFORM(MAC) || (PLATFORM(CHROMIUM) && OS(DARWIN))
-    void handleWheelEventPhase(PlatformWheelEventPhase);
-#endif
-
-    bool canGoBack();
-    bool canGoForward();
-
-    bool rubberBandsAtBottom();
-    void setRubberBandsAtBottom(bool);
-    bool rubberBandsAtTop();
-    void setRubberBandsAtTop(bool);
-
-    bool willWheelEventStartSwipeGesture(const PlatformWheelEvent&);
-
-    void setScrollingPerformanceLoggingEnabled(bool flag);
-    bool scrollingPerformanceLoggingEnabled();
-
-    ScrollingTreeScrollingNode* rootNode() const { return m_rootNode.get(); }
-
-private:
-    explicit ScrollingTree(ScrollingCoordinator*);
-
-    void removeDestroyedNodes(ScrollingStateTree*);
-    void updateTreeFromStateNode(ScrollingStateNode*);
-
-    RefPtr<ScrollingCoordinator> m_scrollingCoordinator;
-    OwnPtr<ScrollingTreeScrollingNode> m_rootNode;
-
-    typedef HashMap<ScrollingNodeID, ScrollingTreeNode*> ScrollingTreeNodeMap;
-    ScrollingTreeNodeMap m_nodeMap;
-
-    Mutex m_mutex;
-    Region m_nonFastScrollableRegion;
-    IntPoint m_mainFrameScrollPosition;
-    bool m_hasWheelEventHandlers;
-
-    Mutex m_swipeStateMutex;
-    bool m_canGoBack;
-    bool m_canGoForward;
-    bool m_mainFramePinnedToTheLeft;
-    bool m_mainFramePinnedToTheRight;
-    bool m_rubberBandsAtBottom;
-    bool m_rubberBandsAtTop;
-    bool m_mainFramePinnedToTheTop;
-    bool m_mainFramePinnedToTheBottom;
-    bool m_mainFrameIsRubberBanding;
-
-    bool m_scrollingPerformanceLoggingEnabled;
-    
-    bool m_isHandlingProgrammaticScroll;
-};
-
-} // namespace WebCore
-
-#endif // ENABLE(THREADED_SCROLLING)
-
-#endif // ScrollingTree_h