Support bottom-right anchored fixed-position elements during a pinch gesture

cc/layer.h

Index: cc/layer.h
diff --git a/cc/layer.h b/cc/layer.h
index 7e8fc6caee7d007d439b52c9e3782eb061c8fa6b..adc09ad11d6f040cf8208b325e23b0ca7b95abc8 100644
--- a/cc/layer.h
+++ b/cc/layer.h
@@ -120,6 +120,12 @@ public:
     void setFixedToContainerLayer(bool);
     bool fixedToContainerLayer() const { return m_fixedToContainerLayer; }
 
+    void setFixedToRightEdge(bool);

[jamesr, 2013/03/07 21:56:01]

Do we need this today?  I think it's nice to have general code but I can't think
of a use-case for fixed to the right edge today.

+    bool fixedToRightEdge() const { return m_fixedToRightEdge; }
+
+    void setFixedToBottomEdge(bool);
+    bool fixedToBottomEdge() const { return m_fixedToBottomEdge; }
+
     void setSublayerTransform(const gfx::Transform&);
     const gfx::Transform& sublayerTransform() const { return m_sublayerTransform; }
 
@@ -377,6 +383,8 @@ private:
     float m_anchorPointZ;
     bool m_isContainerForFixedPositionLayers;
     bool m_fixedToContainerLayer;
+    bool m_fixedToRightEdge;
+    bool m_fixedToBottomEdge;
     bool m_isDrawable;
     bool m_masksToBounds;
     bool m_contentsOpaque;