Add DesktopFrame rotation functions

webrtc/modules/desktop_capture/rgba_color.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 23 matching lines @@
 
 RgbaColor::RgbaColor(uint8_t blue, uint8_t green, uint8_t red)
     : RgbaColor(blue, green, red, 0xff) {}
 
 RgbaColor::RgbaColor(const uint8_t* bgra)
     : RgbaColor(bgra[0], bgra[1], bgra[2], bgra[3]) {}
 
 RgbaColor::RgbaColor(uint32_t bgra)
     : RgbaColor(reinterpret_cast<uint8_t*>(&bgra)) {}
 
+RgbaColor::RgbaColor(int bgra) : RgbaColor(static_cast<uint32_t>(bgra)) {}
+
 bool RgbaColor::operator==(const RgbaColor& right) const {
   return blue == right.blue && green == right.green && red == right.red &&
          AlphaEquals(alpha, right.alpha);
 }
 
 bool RgbaColor::operator!=(const RgbaColor& right) const {
   return !(*this == right);
 }
 
 uint32_t RgbaColor::ToUInt32() const {
 #if defined(WEBRTC_ARCH_LITTLE_ENDIAN)
   return blue | (green << 8) | (red << 16) | (alpha << 24);
 #else
   return (blue << 24) | (green << 16) | (red << 8) | alpha;
 #endif
 }
 
 }  // namespace webrtc