Plumb selection bounds as a single unit

public/platform/WebSelectionBounds.h

+// Copyright 2014 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 WebSelectionBounds_h
+#define WebSelectionBounds_h
+
+#include "public/platform/WebSelectionBound.h"
+
+namespace blink {
+
+// The endpoints for an active selection region.
+struct WebSelectionBounds {
+
+    WebSelectionBounds(const WebSelectionBound& start, const WebSelectionBound& end)
+        : start(start)
+        , end(end)
+        , length(0)
+        , isEditable(false)
+        , isUserTriggered(false)
+    {
+    }
+
+    WebSelectionBound start;
+    WebSelectionBound end;
+
+    // The length, in characters, of the selection.
+    size_t length;
+
+    // Whether the selection region is editable.
+    bool isEditable;
+
+    // Whether the selection was triggered by a user.
+    bool isUserTriggered;
+};
+
+} // namespace blink
+
+#endif