Fixed bug in PacketBuffer to correctly detect new complete frames.

webrtc/modules/video_coding/video_packet_buffer_unittest.cc

Index: webrtc/modules/video_coding/video_packet_buffer_unittest.cc
diff --git a/webrtc/modules/video_coding/video_packet_buffer_unittest.cc b/webrtc/modules/video_coding/video_packet_buffer_unittest.cc
index 6dc4e8fd728f2a643bf39797aa5458e54c2ab0f0..a937af61ad8b0564c3ae833535255e19575156f1 100644
--- a/webrtc/modules/video_coding/video_packet_buffer_unittest.cc
+++ b/webrtc/modules/video_coding/video_packet_buffer_unittest.cc
@@ -425,5 +425,18 @@ TEST_F(TestPacketBuffer, InvalidateFrameByClearing) {
   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