Rework compositor touch hit testing

Source/core/rendering/RenderView.cpp

Index: Source/core/rendering/RenderView.cpp
diff --git a/Source/core/rendering/RenderView.cpp b/Source/core/rendering/RenderView.cpp
index 22e2250ec140247464cb550bb924b517aa295554..d9c98ad91fa6eb0a16a0748334438a1a8685ec38 100644
--- a/Source/core/rendering/RenderView.cpp
+++ b/Source/core/rendering/RenderView.cpp
@@ -301,9 +301,6 @@ void RenderView::layout()
 
 void RenderView::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed) const
 {
-    // If a container was specified, and was not 0 or the RenderView,
-    // then we should have found it by now.
-    ASSERT_ARG(repaintContainer, !repaintContainer || repaintContainer == this);
     ASSERT_UNUSED(wasFixed, !wasFixed || *wasFixed == (mode & IsFixed));
 
     if (!repaintContainer && mode & UseTransforms && shouldUseTransformFromContainer(0)) {
@@ -314,6 +311,23 @@ void RenderView::mapLocalToContainer(const RenderLayerModelObject* repaintContai
     
     if (mode & IsFixed && m_frameView)
         transformState.move(m_frameView->scrollOffsetForFixedPosition());
+
+    if (repaintContainer == this)
+        return;
+
+    if (mode & TraverseDocumentBoundaries) {
+        if (RenderObject* parentDocRenderer = frame()->ownerRenderer()) {
+            transformState.move(-frame()->view()->scrollOffset());
+            if (parentDocRenderer->isBox())
+                transformState.move(toLayoutSize(toRenderBox(parentDocRenderer)->contentBoxRect().location()));
+            parentDocRenderer->mapLocalToContainer(repaintContainer, transformState, mode, wasFixed);
+            return;
+        }
+    }
+
+    // If a container was specified, and was not 0 or the RenderView,
+    // then we should have found it by now.
+    ASSERT_ARG(repaintContainer, !repaintContainer);
 }
 
 const RenderObject* RenderView::pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap& geometryMap) const
@@ -349,6 +363,14 @@ void RenderView::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformStat
     }
 }
 
+void RenderView::computeOwnHitTestRects(Vector<IntRect>& rects, const LayoutPoint&) const
+{
+    // Record the entire size of the contents of the frame. Note that we don't just
+    // use the viewport size (containing block) here because we want to ensure this includes
+    // all children (so we can avoid walking them explicitly).
+    rects.append(IntRect(IntPoint::zero(), frameView()->contentsSize()));
+}
+
 bool RenderView::requiresColumns(int desiredColumnCount) const
 {
     if (m_frameView)