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

cc/layers/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_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/animation/layer_animation_event_observer.h"
 #include "cc/animation/layer_animation_value_observer.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/region.h"
 #include "cc/layers/draw_properties.h"
+#include "cc/layers/layer_position_constraint.h"
 #include "cc/layers/render_surface.h"
 #include "cc/trees/occlusion_tracker.h"
 #include "skia/ext/refptr.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebFilterOperations.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 #include "ui/gfx/transform.h"
 
@@ skipping 87 matching lines @@
     return background_filters_;
   }
 
   virtual void SetContentsOpaque(bool opaque);
   bool contents_opaque() const { return contents_opaque_; }
 
   void SetPosition(gfx::PointF position);
   gfx::PointF position() const { return position_; }
 
   void SetIsContainerForFixedPositionLayers(bool container);
-  bool is_container_for_fixed_position_layers() const {
-    return is_container_for_fixed_position_layers_;
+  bool is_container_for_fixed_position_layers() const;

[Sami, 2013/03/25 11:41:37]

This should be renamed to IsContainerForFixedPositionLayers() now that it's not
a simple getter anymore.

[trchen, 2013/03/26 01:45:28]

Done.

+
+  void SetPositionConstraint(const LayerPositionConstraint& constraint);
+  const LayerPositionConstraint& position_constraint() const {
+    return position_constraint_;
   }
 
-  void SetFixedToContainerLayer(bool fixed_to_container_layer);
-  bool fixed_to_container_layer() const { return fixed_to_container_layer_; }
-
   void SetSublayerTransform(const gfx::Transform& sublayer_transform);
   const gfx::Transform& sublayer_transform() const {
     return sublayer_transform_;
   }
 
   void SetTransform(const gfx::Transform& transform);
   const gfx::Transform& transform() const { return transform_; }
   bool TransformIsAnimating() const;
 
   DrawProperties<Layer, RenderSurface>& draw_properties() {
@@ skipping 302 matching lines @@
   gfx::PointF position_;
   gfx::PointF anchor_point_;
   SkColor background_color_;
   std::string debug_name_;
   float opacity_;
   skia::RefPtr<SkImageFilter> filter_;
   WebKit::WebFilterOperations filters_;
   WebKit::WebFilterOperations background_filters_;
   float anchor_point_z_;
   bool is_container_for_fixed_position_layers_;
-  bool fixed_to_container_layer_;
+  LayerPositionConstraint position_constraint_;
   bool is_drawable_;
   bool masks_to_bounds_;
   bool contents_opaque_;
   bool double_sided_;
   bool preserves_3d_;
   bool use_parent_backface_visibility_;
   bool draw_checkerboard_for_missing_tiles_;
   bool force_render_surface_;
 
   gfx::Transform transform_;
@@ skipping 13 matching lines @@
   WebKit::WebLayerScrollClient* layer_scroll_client_;
 
   DrawProperties<Layer, RenderSurface> draw_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_