First pass at removing position:fixed.

sky/engine/core/rendering/RenderBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 1078 matching lines @@
 void RenderBlock::addOverflowFromPositionedObjects()
 {
     TrackedRendererListHashSet* positionedDescendants = positionedObjects();
     if (!positionedDescendants)
         return;
 
     RenderBox* positionedObject;
     TrackedRendererListHashSet::iterator end = positionedDescendants->end();
     for (TrackedRendererListHashSet::iterator it = positionedDescendants->begin(); it != end; ++it) {
         positionedObject = *it;
-
-        // Fixed positioned elements don't contribute to layout overflow, since they don't scroll with the content.
-        if (positionedObject->style()->position() != FixedPosition)
-            addOverflowFromChild(positionedObject, LayoutSize(positionedObject->x(), positionedObject->y()));
+        addOverflowFromChild(positionedObject, LayoutSize(positionedObject->x(), positionedObject->y()));
     }
 }
 
 bool RenderBlock::createsBlockFormattingContext() const
 {
     return isInlineBlock() || isFloatingOrOutOfFlowPositioned() || hasOverflowClip() || isFlexItemIncludingDeprecated()
         || isWritingModeRoot() || isDocumentElement();
 }
 
 void RenderBlock::updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox* child)
@@ skipping 84 matching lines @@
     updateLayerTransformAfterLayout();
 
     updateScrollInfoAfterLayout();
 
     clearNeedsLayout();
     return true;
 }
 
 void RenderBlock::markFixedPositionObjectForLayoutIfNeeded(RenderObject* child, SubtreeLayoutScope& layoutScope)
 {
-    if (child->style()->position() != FixedPosition)
-        return;
-
-    bool hasStaticBlockPosition = child->style()->hasStaticBlockPosition(isHorizontalWritingMode());
-    bool hasStaticInlinePosition = child->style()->hasStaticInlinePosition(isHorizontalWritingMode());
-    if (!hasStaticBlockPosition && !hasStaticInlinePosition)
-        return;
-
-    RenderObject* o = child->parent();
-    while (o && !o->isRenderView() && o->style()->position() != AbsolutePosition)
-        o = o->parent();
-    if (o->style()->position() != AbsolutePosition)
-        return;
-
-    RenderBox* box = toRenderBox(child);
-    if (hasStaticInlinePosition) {
-        LogicalExtentComputedValues computedValues;
-        box->computeLogicalWidth(computedValues);
-        LayoutUnit newLeft = computedValues.m_position;
-        if (newLeft != box->logicalLeft())
-            layoutScope.setChildNeedsLayout(child);
-    } else if (hasStaticBlockPosition) {
-        LayoutUnit oldTop = box->logicalTop();
-        box->updateLogicalHeight();
-        if (box->logicalTop() != oldTop)
-            layoutScope.setChildNeedsLayout(child);
-    }
+    // FIXME(sky): Remove
 }
 
 LayoutUnit RenderBlock::marginIntrinsicLogicalWidthForChild(RenderBox* child) const
 {
     // A margin has three types: fixed, percentage, and auto (variable).
     // Auto and percentage margins become 0 when computing min/max width.
     // Fixed margins can be added in as is.
     Length marginLeft = child->style()->marginStartUsing(style());
     Length marginRight = child->style()->marginEndUsing(style());
     LayoutUnit margin = 0;
@@ skipping 1944 matching lines @@
     if (!positionedDescendants)
         return childrenOverflowChanged;
 
     TrackedRendererListHashSet::iterator end = positionedDescendants->end();
     for (TrackedRendererListHashSet::iterator it = positionedDescendants->begin(); it != end; ++it) {
         RenderBox* box = *it;
 
         if (!box->needsOverflowRecalcAfterStyleChange())
             continue;
         RenderBlock* block = toRenderBlock(box);
-        if (!block->recalcOverflowAfterStyleChange() || box->style()->position() == FixedPosition)
+        if (!block->recalcOverflowAfterStyleChange())
             continue;
 
         childrenOverflowChanged = true;
     }
     return childrenOverflowChanged;
 }
 
 bool RenderBlock::recalcOverflowAfterStyleChange()
 {
     ASSERT(needsOverflowRecalcAfterStyleChange());
@@ skipping 42 matching lines @@
 void RenderBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj) const
 {
     showRenderObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink