Plumb selection bounds as a single unit

Source/core/layout/compositing/CompositedSelection.h

 /*
- * Copyright (C) 2014 Google Inc. All rights reserved.
+ * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  */
 
-#ifndef CompositedSelectionBound_h
-#define CompositedSelectionBound_h
+#ifndef CompositedSelection_h
+#define CompositedSelection_h
 
+#include "core/editing/SelectionType.h"
+#include "core/layout/compositing/CompositedSelectionBound.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/graphics/GraphicsLayer.h"
 
 namespace blink {
 
-struct CompositedSelectionBound {
-    enum Type {
-        Caret,
-        SelectionLeft,
-        SelectionRight
-    };
+// The active selection region, containing compositing data for the selection
+// end points as well as metadata for the selection region.
+// See |WebSelection|.
+struct CompositedSelection {
 
-    CompositedSelectionBound()
-        : type(Caret)
-        , layer(nullptr)
+    CompositedSelection()
+        : type(NoSelection)
+        , isEditable(false)
+        , isEmptyTextFormControl(false)
     {
     }
 
-    Type type;
-
-    // The structure describes the position of a caret in space of the GraphicsLayer the caret resides in.
-    // Where edgeTopInLayer is the top point of the caret, usually on the ascend line of the line box,
-    // and edgeBottomInLayer it the bottom point, on the baseline of the line box.
-    GraphicsLayer* layer;
-    FloatPoint edgeTopInLayer;
-    FloatPoint edgeBottomInLayer;
+    SelectionType type;
+    CompositedSelectionBound start;
+    CompositedSelectionBound end;
+    bool isEditable;
+    bool isEmptyTextFormControl;
 };
 
 } // namespace blink
 
-#endif
+#endif // CompositedSelection_h