Reland of Add ability to scale to arbitrary factors

webrtc/media/base/adaptedvideotracksource.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.
  */
 
 #include "webrtc/media/base/adaptedvideotracksource.h"
 
 namespace rtc {
 
 AdaptedVideoTrackSource::AdaptedVideoTrackSource() {
   thread_checker_.DetachFromThread();
 }
 
+AdaptedVideoTrackSource::AdaptedVideoTrackSource(int required_alignment)
+    : video_adapter_(required_alignment) {
+  thread_checker_.DetachFromThread();
+}
+
 bool AdaptedVideoTrackSource::GetStats(Stats* stats) {
   rtc::CritScope lock(&stats_crit_);
 
   if (!stats_) {
     return false;
   }
 
   *stats = *stats_;
   return true;
 }
@@ skipping 73 matching lines @@
     // VideoAdapter dropped the frame.
     return false;
   }
 
   *crop_x = (width - *crop_width) / 2;
   *crop_y = (height - *crop_height) / 2;
   return true;
 }
 
 }  // namespace rtc