Adds support for point conversions to ui::Layer.

ui/gfx/compositor/layer.h

 // Copyright (c) 2011 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 UI_GFX_COMPOSITOR_LAYER_H_
 #define UI_GFX_COMPOSITOR_LAYER_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 26 matching lines @@
   // Removes a Layer from this Layer.
   void Remove(Layer* child);
 
   // Returns the child Layers.
   const std::vector<Layer*>& children() { return children_; }
 
   // The parent.
   const Layer* parent() const { return parent_; }
   Layer* parent() { return parent_; }
 
+  // Returns true if this Layer contains |other| somewhere in its children.
+  bool Contains(const Layer* other) const;
+
   // The transform, relative to the parent.
   void SetTransform(const ui::Transform& transform);
   const ui::Transform& transform() const { return transform_; }
 
   // The bounds, relative to the parent.
   void SetBounds(const gfx::Rect& bounds);
   const gfx::Rect& bounds() const { return bounds_; }
 
+  // Converts a point from the coordinates of |source| to the coordinates of
+  // |target|. Necessarily, |source| and |target| must inhabit the same Layer
+  // tree.
+  static void ConvertPointToLayer(const Layer* source,
+                                  const Layer* target,
+                                  gfx::Point* point);
+
   // See description in View for details
   void SetFillsBoundsOpaquely(bool fills_bounds_opaquely);
   bool fills_bounds_opaquely() const { return fills_bounds_opaquely_; }
 
   const gfx::Rect& hole_rect() const {  return hole_rect_; }
 
   // The compositor.
   const Compositor* compositor() const { return compositor_; }
   Compositor* compositor() { return compositor_; }
 
@@ skipping 30 matching lines @@
 
   // A hole in a layer is an area in the layer that does not get drawn
   // because this area is covered up with another layer which is known to be
   // opaque.
   // This method computes the dimension of the hole (if there is one)
   // based on whether one of its child nodes is always opaque.
   // Note: For simpicity's sake, currently a hole is only created if the child
   // view has no transfrom with respect to its parent.
   void RecomputeHole();
 
+  bool ConvertPointForAncestor(const Layer* ancestor, gfx::Point* point) const;
+  bool ConvertPointFromAncestor(const Layer* ancestor, gfx::Point* point) const;
+
+  bool GetTransformRelativeTo(const Layer* ancestor,
+                              Transform* transform) const;
+
   Compositor* compositor_;
 
   scoped_refptr<ui::Texture> texture_;
 
   Layer* parent_;
 
   std::vector<Layer*> children_;
 
   ui::Transform transform_;
 
   gfx::Rect bounds_;
 
   bool fills_bounds_opaquely_;
 
   gfx::Rect hole_rect_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_GFX_COMPOSITOR_LAYER_H_