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

cc/layer.h

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYER_H_
 #define CC_LAYER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 102 matching lines @@
 
     void setPosition(const gfx::PointF&);
     gfx::PointF position() const { return m_position; }
 
     void setIsContainerForFixedPositionLayers(bool);
     bool isContainerForFixedPositionLayers() const { return m_isContainerForFixedPositionLayers; }
 
     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; }
 
     void setTransform(const gfx::Transform&);
     const gfx::Transform& transform() const;
     bool transformIsAnimating() const;
 
     DrawProperties<Layer, RenderSurface>& drawProperties() { return m_drawProperties; }
     const DrawProperties<Layer, RenderSurface>& drawProperties() const { return m_drawProperties; }
 
@@ skipping 237 matching lines @@
     gfx::PointF m_anchorPoint;
     SkColor m_backgroundColor;
     std::string m_debugName;
     float m_opacity;
     skia::RefPtr<SkImageFilter> m_filter;
     WebKit::WebFilterOperations m_filters;
     WebKit::WebFilterOperations m_backgroundFilters;
     float m_anchorPointZ;
     bool m_isContainerForFixedPositionLayers;
     bool m_fixedToContainerLayer;
+    bool m_fixedToRightEdge;
+    bool m_fixedToBottomEdge;
     bool m_isDrawable;
     bool m_masksToBounds;
     bool m_contentsOpaque;
     bool m_doubleSided;
     bool m_preserves3D;
     bool m_useParentBackfaceVisibility;
     bool m_drawCheckerboardForMissingTiles;
     bool m_forceRenderSurface;
 
     gfx::Transform m_transform;
@@ skipping 13 matching lines @@
     WebKit::WebLayerScrollClient* m_layerScrollClient;
 
     DrawProperties<Layer, RenderSurface> m_drawProperties;
 };
 
 void sortLayers(std::vector<scoped_refptr<Layer> >::iterator, std::vector<scoped_refptr<Layer> >::iterator, void*);
 
 }  // namespace cc
 
 #endif  // CC_LAYER_H_