Renamed FrameObject to EncodedFrame.

The plan is to:
 1. Move FrameObject to api/video.
 2. Rename FrameObject to EncodedFrame.
 3. Move EncodedFrame out of the video_coding namespace.

This is the 2nd CL.

Bug: webrtc:8909
Change-Id: I5e76a0a3b306156b8bc1de67834b4adf14bebef9
Reviewed-on: https://webrtc-review.googlesource.com/56182
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22158}
diff --git a/modules/video_coding/frame_buffer2.cc b/modules/video_coding/frame_buffer2.cc
index 87fc498..db09e76 100644
--- a/modules/video_coding/frame_buffer2.cc
+++ b/modules/video_coding/frame_buffer2.cc
@@ -60,7 +60,7 @@
 
 FrameBuffer::ReturnReason FrameBuffer::NextFrame(
     int64_t max_wait_time_ms,
-    std::unique_ptr<FrameObject>* frame_out,
+    std::unique_ptr<EncodedFrame>* frame_out,
     bool keyframe_required) {
   TRACE_EVENT0("webrtc", "FrameBuffer::NextFrame");
   int64_t latest_return_time_ms =
@@ -106,7 +106,7 @@
           continue;
         }
 
-        FrameObject* frame = frame_it->second.frame.get();
+        EncodedFrame* frame = frame_it->second.frame.get();
 
         if (keyframe_required && !frame->is_keyframe())
           continue;
@@ -134,7 +134,7 @@
     rtc::CritScope lock(&crit_);
     now_ms = clock_->TimeInMilliseconds();
     if (next_frame_it_ != frames_.end()) {
-      std::unique_ptr<FrameObject> frame =
+      std::unique_ptr<EncodedFrame> frame =
           std::move(next_frame_it_->second.frame);
 
       if (!frame->delayed_by_retransmission()) {
@@ -208,7 +208,8 @@
   return kTimeout;
 }
 
-bool FrameBuffer::HasBadRenderTiming(const FrameObject& frame, int64_t now_ms) {
+bool FrameBuffer::HasBadRenderTiming(const EncodedFrame& frame,
+                                     int64_t now_ms) {
   // Assume that render timing errors are due to changes in the video stream.
   int64_t render_time_ms = frame.RenderTimeMs();
   const int64_t kMaxVideoDelayMs = 10000;
@@ -255,7 +256,7 @@
   jitter_estimator_->UpdateRtt(rtt_ms);
 }
 
-bool FrameBuffer::ValidReferences(const FrameObject& frame) const {
+bool FrameBuffer::ValidReferences(const EncodedFrame& frame) const {
   if (frame.picture_id < 0)
     return false;
 
@@ -275,7 +276,7 @@
   return true;
 }
 
-void FrameBuffer::UpdatePlayoutDelays(const FrameObject& frame) {
+void FrameBuffer::UpdatePlayoutDelays(const EncodedFrame& frame) {
   TRACE_EVENT0("webrtc", "FrameBuffer::UpdatePlayoutDelays");
   PlayoutDelay playout_delay = frame.EncodedImage().playout_delay_;
   if (playout_delay.min_ms >= 0)
@@ -285,7 +286,7 @@
     timing_->set_max_playout_delay(playout_delay.max_ms);
 }
 
-int64_t FrameBuffer::InsertFrame(std::unique_ptr<FrameObject> frame) {
+int64_t FrameBuffer::InsertFrame(std::unique_ptr<EncodedFrame> frame) {
   TRACE_EVENT0("webrtc", "FrameBuffer::InsertFrame");
   RTC_DCHECK(frame);
   if (stats_callback_)
@@ -459,7 +460,7 @@
   }
 }
 
-bool FrameBuffer::UpdateFrameInfoWithIncomingFrame(const FrameObject& frame,
+bool FrameBuffer::UpdateFrameInfoWithIncomingFrame(const EncodedFrame& frame,
                                                    FrameMap::iterator info) {
   TRACE_EVENT0("webrtc", "FrameBuffer::UpdateFrameInfoWithIncomingFrame");
   FrameKey key(frame.picture_id, frame.spatial_layer);