Fixed bug in PacketBuffer to correctly detect new complete frames.

webrtc/modules/video_coding/video_packet_buffer_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 407 matching lines @@
 TEST_F(TestPacketBuffer, InvalidateFrameByClearing) {
   const uint16_t seq_num = Rand();
 
   EXPECT_TRUE(Insert(seq_num, kKeyFrame, kFirst, kLast));
   ASSERT_EQ(1UL, frames_from_callback_.size());
 
   packet_buffer_->Clear();
   EXPECT_FALSE(frames_from_callback_.begin()->second->GetBitstream(nullptr));
 }
 
+TEST_F(TestPacketBuffer, FramesAfterClear) {
+  Insert(9025, kDeltaFrame, kFirst, kLast);
+  Insert(9024, kKeyFrame, kFirst, kLast);
+  packet_buffer_->ClearTo(9025);
+  Insert(9057, kDeltaFrame, kFirst, kLast);
+  Insert(9026, kDeltaFrame, kFirst, kLast);
+
+  CheckFrame(9024);
+  CheckFrame(9025);
+  CheckFrame(9026);
+  CheckFrame(9057);
+}
+
 }  // namespace video_coding
 }  // namespace webrtc