Added ClearTo(seq_num) to RtpFrameReferenceFinder.

webrtc/modules/video_coding/rtp_frame_reference_finder_unittest.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 254 matching lines @@
   reference_finder_->PaddingReceived(sn + 4);
   InsertGeneric(sn + 2, sn + 3, false);
   InsertGeneric(sn + 5, sn + 5, true);
   reference_finder_->PaddingReceived(sn + 6);
   reference_finder_->PaddingReceived(sn + 9);
   InsertGeneric(sn + 7, sn + 8, false);
 
   EXPECT_EQ(4UL, frames_from_callback_.size());
 }
 
+TEST_F(TestRtpFrameReferenceFinder, ClearTo) {
+  uint16_t sn = Rand();
+
+  InsertGeneric(sn, sn + 1, true);
+  InsertGeneric(sn + 4, sn + 5, false);  // stashed
+  EXPECT_EQ(1UL, frames_from_callback_.size());
+
+  InsertGeneric(sn + 6, sn + 7, true);  // keyframe
+  EXPECT_EQ(2UL, frames_from_callback_.size());
+  reference_finder_->ClearTo(sn + 7);
+
+  InsertGeneric(sn + 8, sn + 9, false);  // first frame after keyframe.
+  EXPECT_EQ(3UL, frames_from_callback_.size());
+
+  InsertGeneric(sn + 2, sn + 3, false);  // late, cleared past this frame.
+  EXPECT_EQ(3UL, frames_from_callback_.size());
+}
+
 TEST_F(TestRtpFrameReferenceFinder, Vp8NoPictureId) {
   uint16_t sn = Rand();
 
   InsertVp8(sn, sn + 2, true);
   ASSERT_EQ(1UL, frames_from_callback_.size());
 
   InsertVp8(sn + 3, sn + 4, false);
   ASSERT_EQ(2UL, frames_from_callback_.size());
 
   InsertVp8(sn + 5, sn + 8, false);
@@ skipping 901 matching lines @@
   CheckReferencesVp9(pid + 5, 1, pid + 4);
   CheckReferencesVp9(pid + 6, 0, pid + 4);
   CheckReferencesVp9(pid + 6, 1, pid + 5);
   CheckReferencesVp9(pid + 7, 1, pid + 6);
   CheckReferencesVp9(pid + 8, 0, pid + 6);
   CheckReferencesVp9(pid + 8, 1, pid + 7);
 }
 
 }  // namespace video_coding
 }  // namespace webrtc