Plumb selection edge points through the compositor

cc/input/layer_selection_bound.h

Index: cc/input/layer_selection_bound.h
diff --git a/cc/input/layer_selection_bound.h b/cc/input/layer_selection_bound.h
index 30b2c8016ed2aefccb8b85f36f5b8647c1215933..21d52849cf3465d865866771faf807acfe81594e 100644
--- a/cc/input/layer_selection_bound.h
+++ b/cc/input/layer_selection_bound.h
@@ -7,7 +7,7 @@
 
 #include "cc/base/cc_export.h"
 #include "cc/input/selection_bound_type.h"
-#include "ui/gfx/geometry/rect_f.h"
+#include "ui/gfx/geometry/point_f.h"
 
 namespace cc {
 
@@ -17,7 +17,8 @@ struct CC_EXPORT LayerSelectionBound {
   ~LayerSelectionBound();
 
   SelectionBoundType type;
-  gfx::RectF layer_rect;
+  gfx::PointF edge_top;
+  gfx::PointF edge_bottom;
   int layer_id;
 };