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

cc/layer.cc

Index: cc/layer.cc
diff --git a/cc/layer.cc b/cc/layer.cc
index 07c811b42256e2792d8ecf842316f469fd7e4e37..d4a0e6f2ae4dd59876670cb683254732f62cf4b3 100644
--- a/cc/layer.cc
+++ b/cc/layer.cc
@@ -41,6 +41,8 @@ Layer::Layer()
     , m_anchorPointZ(0)
     , m_isContainerForFixedPositionLayers(false)
     , m_fixedToContainerLayer(false)
+    , m_fixedToRightEdge(false)
+    , m_fixedToBottomEdge(false)
     , m_isDrawable(false)
     , m_masksToBounds(false)
     , m_contentsOpaque(false)
@@ -621,6 +623,24 @@ void Layer::setFixedToContainerLayer(bool fixedToContainerLayer)
     setNeedsCommit();
 }
 
+void Layer::setFixedToRightEdge(bool fixedToRightEdge)
+{
+    if (m_fixedToRightEdge == fixedToRightEdge)
+        return;
+    m_fixedToRightEdge = fixedToRightEdge;
+    if (m_fixedToContainerLayer)
+        setNeedsCommit();
+}
+
+void Layer::setFixedToBottomEdge(bool fixedToBottomEdge)
+{
+    if (m_fixedToBottomEdge == fixedToBottomEdge)
+        return;
+    m_fixedToBottomEdge = fixedToBottomEdge;
+    if (m_fixedToContainerLayer)
+        setNeedsCommit();
+}
+
 void Layer::pushPropertiesTo(LayerImpl* layer)
 {
     layer->setAnchorPoint(m_anchorPoint);
@@ -647,7 +667,10 @@ void Layer::pushPropertiesTo(LayerImpl* layer)
         layer->setOpacity(m_opacity);
     layer->setPosition(m_position);
     layer->setIsContainerForFixedPositionLayers(m_isContainerForFixedPositionLayers);
+    layer->setFixedContainerSizeDelta(gfx::Vector2dF());
     layer->setFixedToContainerLayer(m_fixedToContainerLayer);
+    layer->setFixedToRightEdge(m_fixedToRightEdge);
+    layer->setFixedToBottomEdge(m_fixedToBottomEdge);
     layer->setPreserves3D(preserves3D());
     layer->setUseParentBackfaceVisibility(m_useParentBackfaceVisibility);
     layer->setSublayerTransform(m_sublayerTransform);