WIP: Construct SPV2's scroll paint property tree

third_party/WebKit/Source/core/paint/PaintPropertyTreePrinter.cpp

Index: third_party/WebKit/Source/core/paint/PaintPropertyTreePrinter.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintPropertyTreePrinter.cpp b/third_party/WebKit/Source/core/paint/PaintPropertyTreePrinter.cpp
index ecfa21d905a89406622d2507c7e5bfa4d29594ba..85f43fb7cfe1a5d94a5aecebb7cd6543cb815733 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreePrinter.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreePrinter.cpp
@@ -192,6 +192,30 @@ public:
     }
 };
 
+template <>
+class PropertyTreePrinterTraits<ScrollPaintPropertyNode> {
+public:
+    static void addFrameViewProperties(const FrameView& frameView, PropertyTreePrinter<ScrollPaintPropertyNode>& printer)
+    {
+        if (const ScrollPaintPropertyNode* rootScroll = frameView.rootScroll())
+            printer.addPropertyNode(rootScroll, "RootScroll (FrameView)");
+        if (const ScrollPaintPropertyNode* scroll = frameView.scroll())
+            printer.addPropertyNode(scroll, "Scroll (FrameView)");
+    }
+
+    static void addObjectPaintProperties(const LayoutObject& object, const ObjectPaintProperties& paintProperties, PropertyTreePrinter<ScrollPaintPropertyNode>& printer)
+    {
+        if (const ScrollPaintPropertyNode* scroll = paintProperties.scroll())
+            printer.addPropertyNode(scroll, "Scroll (" + object.debugName() + ")");
+    }
+
+    static void printNodeAsString(const ScrollPaintPropertyNode* node, StringBuilder& stringBuilder)
+    {
+        // TODO(pdr): Fill this out.
+        stringBuilder.append(String::format(" transform=%p ", node->transform()));
+    }
+};
+
 class PaintPropertyTreeGraphBuilder {
 public:
     PaintPropertyTreeGraphBuilder() { }
@@ -318,6 +342,11 @@ private:
             writeParentEdge(&node, node.parent(), s_effectNodeColor, os);
     }
 
+    void writePaintPropertyNode(const ScrollPaintPropertyNode&, const void*, const char*)
+    {
+        // TODO(pdr): fill this out.
+    }
+
     void writeObjectPaintPropertyNodes(const LayoutObject& object)
     {
         const ObjectPaintProperties* properties = object.objectPaintProperties();
@@ -356,6 +385,9 @@ private:
             if (object.isLayoutView() && overflowClip->parent())
                 writePaintPropertyNode(*overflowClip->parent(), nullptr, "rootClip");
         }
+        const ScrollPaintPropertyNode* scroll = properties->scroll();
+        if (scroll)
+            writePaintPropertyNode(*scroll, &object, "scroll");
     }
 
     void writeFrameViewPaintPropertyNodes(const FrameView& frameView)
@@ -378,6 +410,9 @@ private:
         ClipPaintPropertyNode* contentClip = frameView.contentClip();
         if (contentClip)
             writePaintPropertyNode(*contentClip, &frameView, "contentClip");
+        ScrollPaintPropertyNode* scroll = frameView.scroll();
+        if (scroll)
+            writePaintPropertyNode(*scroll, &frameView, "scroll");
     }
 
     void writeLayoutObjectNode(const LayoutObject& object)
@@ -456,6 +491,11 @@ void showEffectPropertyTree(const blink::FrameView& rootFrame)
     blink::PropertyTreePrinter<blink::EffectPaintPropertyNode>().showTree(rootFrame);
 }
 
+void showScrollPropertyTree(const blink::FrameView& rootFrame)
+{
+    blink::PropertyTreePrinter<blink::ScrollPaintPropertyNode>().showTree(rootFrame);
+}
+
 void showPaintPropertyPath(const blink::TransformPaintPropertyNode* node)
 {
     blink::PropertyTreePrinter<blink::TransformPaintPropertyNode>().showPath(node);
@@ -471,6 +511,11 @@ void showPaintPropertyPath(const blink::EffectPaintPropertyNode* node)
     blink::PropertyTreePrinter<blink::EffectPaintPropertyNode>().showPath(node);
 }
 
+void showPaintPropertyPath(const blink::ScrollPaintPropertyNode* node)
+{
+    blink::PropertyTreePrinter<blink::ScrollPaintPropertyNode>().showPath(node);
+}
+
 String paintPropertyTreeGraph(const blink::FrameView& frameView)
 {
     blink::PaintPropertyTreeGraphBuilder builder;