Reland: Don't early out recursion into PaintLayerChildren when computing composited bounds.

third_party/WebKit/Source/core/paint/PaintLayer.h

Index: third_party/WebKit/Source/core/paint/PaintLayer.h
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.h b/third_party/WebKit/Source/core/paint/PaintLayer.h
index 900e8ee1c8076553eb252bd8908b847ee91f186b..83a1cca989d786c251052715f5b8aa73b1116597 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayer.h
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.h
@@ -428,14 +428,12 @@ class CORE_EXPORT PaintLayer : public DisplayItemClient {
   LayoutRect boxForClipPath() const;
 
   LayoutRect boundingBoxForCompositingOverlapTest() const;
+  LayoutRect boundingBoxForCompositing() const;
 
   // If true, this layer's children are included in its bounds for overlap
   // testing.  We can't rely on the children's positions if this layer has a
   // filter that could have moved the children's pixels around.
   bool overlapBoundsIncludeChildren() const;
-  LayoutRect boundingBoxForCompositing(
-      const PaintLayer* ancestorLayer = 0,
-      CalculateBoundsOptions = MaybeIncludeTransformForAncestorLayer) const;
 
   LayoutUnit staticInlinePosition() const { return m_staticInlinePosition; }
   LayoutUnit staticBlockPosition() const { return m_staticBlockPosition; }
@@ -1109,6 +1107,17 @@ class CORE_EXPORT PaintLayer : public DisplayItemClient {
 
   bool shouldFragmentCompositedBounds(const PaintLayer* compositingLayer) const;
 
+  void expandRectForStackingChildren(const PaintLayer* compositedLayer,
+                                     LayoutRect& result,
+                                     PaintLayer::CalculateBoundsOptions) const;
+
+  // The return value is in the space of |stackingParent|, if non-null, or
+  // |this| otherwise.
+  LayoutRect boundingBoxForCompositingInternal(
+      const PaintLayer* compositedLayer,
+      const PaintLayer* stackingParent,
+      CalculateBoundsOptions) const;
+
   // Self-painting layer is an optimization where we avoid the heavy Layer
   // painting machinery for a Layer allocated only to handle the overflow clip
   // case.