/usr/include/firefox-esr-52/RegionBuilder.h is in firefox-esr-dev 52.8.1esr-1~deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | /* This Source Code Form is subject to the terms of the Mozilla Public
 *  * License, v. 2.0. If a copy of the MPL was not distributed with this
 *  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef RegionBuilder_h__
#define RegionBuilder_h__
#include <nsTArray.h>
template <typename RegionType>
class RegionBuilder
{
public:
  typedef typename RegionType::RectType RectType;
  RegionBuilder()
  {}
  void OrWith(const RectType& aRect) {
    pixman_box32_t box = { aRect.x, aRect.y, aRect.XMost(), aRect.YMost() };
    mRects.AppendElement(box);
  }
  RegionType ToRegion() const {
    return RegionType(mRects);
  }
private:
  nsTArray<pixman_box32_t> mRects;
};
#endif // RegionBuilder_h__
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