Put transform tree building in DisplayItemPropertyTreeBuilder.

Source/platform/graphics/paint/DisplayItemTransformTreeBuilder.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 DisplayItemTransformTreeBuilder_h
-#define DisplayItemTransformTreeBuilder_h
-
-#include "platform/PlatformExport.h"
-#include "platform/geometry/FloatSize.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/Vector.h"
-
-namespace blink {
-
-class DisplayItem;
-class DisplayItemTransformTree;
-
-class PLATFORM_EXPORT DisplayItemTransformTreeBuilder {
-public:
-    DisplayItemTransformTreeBuilder();
-    ~DisplayItemTransformTreeBuilder();
-
-    // Detach the built transform tree.
-    // This can be used to construct a WebDisplayItemTransformTree.
-    PassOwnPtr<DisplayItemTransformTree> releaseTransformTree();
-
-    // Process another display item from the list.
-    void processDisplayItem(const DisplayItem&);
-
-private:
-    struct CurrentTransformNodeData {
-        CurrentTransformNodeData(size_t nodeIndex, const FloatSize& offsetFromOrigin)
-            : transformNode(nodeIndex), offset(offsetFromOrigin), ignoredBeginCount(0) { }
-
-        // Index of the current transform node.
-        size_t transformNode;
-
-        // Offset of the current origin (i.e. where a drawing at (0, 0) would
-        // be) from that node's origin.
-        FloatSize offset;
-
-        // Number of "begin" display items that have been ignored, whose
-        // corresponding "end" display items should be skipped.
-        unsigned ignoredBeginCount;
-    };
-
-    // Emit a range record, unless it would be empty.
-    void finishRange();
-
-    // Used to manipulate the current transform node stack.
-    CurrentTransformNodeData& currentTransformNodeData() { return m_currentTransformNodeStack.last(); }
-    void pushCurrentTransformNode(size_t nodeIndex, const FloatSize& offsetFromOrigin)
-    {
-        m_currentTransformNodeStack.append(CurrentTransformNodeData(nodeIndex, offsetFromOrigin));
-    }
-    void popCurrentTransformNode() { m_currentTransformNodeStack.removeLast(); }
-
-    OwnPtr<DisplayItemTransformTree> m_transformTree;
-    Vector<CurrentTransformNodeData, 16> m_currentTransformNodeStack;
-    size_t m_rangeBeginIndex;
-    size_t m_currentIndex;
-};
-
-} // namespace
-
-#endif // DisplayItemTransformTreeBuilder_h