[CSS Grid Layout] Fix positioned grid children position and size

Source/core/rendering/RenderBox.h

Index: Source/core/rendering/RenderBox.h
diff --git a/Source/core/rendering/RenderBox.h b/Source/core/rendering/RenderBox.h
index 0dc27147f21e9d0e97c9cd9a70a68b0612504eb4..012b4dac0a37fe4627ad2006a90d5a322f69ac64 100644
--- a/Source/core/rendering/RenderBox.h
+++ b/Source/core/rendering/RenderBox.h
@@ -183,7 +183,9 @@ public:
 
     // Use this with caution! No type checking is done!
     RenderBox* previousSiblingBox() const;
+    RenderBox* previousInFlowSiblingBox() const;
     RenderBox* nextSiblingBox() const;
+    RenderBox* nextInFlowSiblingBox() const;
     RenderBox* parentBox() const;
 
     bool canResize() const;
@@ -774,11 +776,25 @@ inline RenderBox* RenderBox::previousSiblingBox() const
     return toRenderBox(previousSibling());
 }
 
+inline RenderBox* RenderBox::previousInFlowSiblingBox() const
+{
+    RenderBox* previous;
+    for (previous = previousSiblingBox(); previous && previous->isOutOfFlowPositioned(); previous = previous->previousSiblingBox()) { }

[Julien - ping for review, 2014/11/24 21:44:40]

Nit: I prefer 2 lines to abide by Blink's 1 statement per line intent.

[Manuel Rego, 2014/12/01 11:10:37]

I've changed it for a while,
which probably makes it easer to understand.

+    return previous;
+}
+
 inline RenderBox* RenderBox::nextSiblingBox() const
 {
     return toRenderBox(nextSibling());
 }
 
+inline RenderBox* RenderBox::nextInFlowSiblingBox() const
+{
+    RenderBox* next;
+    for (next = nextSiblingBox(); next && next->isOutOfFlowPositioned(); next = next->nextSiblingBox()) { }

[Julien - ping for review, 2014/11/24 21:44:40]

Ditto.

[Manuel Rego, 2014/12/01 11:10:37]

Acknowledged.

+    return next;
+}
+
 inline RenderBox* RenderBox::parentBox() const
 {
     return toRenderBox(parent());