Add accessor methods for RTP timestamp of EncodedImage.

Intention is to make the member private, but downstream callers
must be updated to use the accessor methods first.

Bug: webrtc:9378
Change-Id: I3495bd8d545b7234fbea10abfd14f082caa420b6
Reviewed-on: https://webrtc-review.googlesource.com/82160
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24352}
diff --git a/modules/video_coding/jitter_buffer.cc b/modules/video_coding/jitter_buffer.cc
index 03a9845..4a0622a 100644
--- a/modules/video_coding/jitter_buffer.cc
+++ b/modules/video_coding/jitter_buffer.cc
@@ -54,7 +54,7 @@
 }
 
 void FrameList::InsertFrame(VCMFrameBuffer* frame) {
-  insert(rbegin().base(), FrameListPair(frame->TimeStamp(), frame));
+  insert(rbegin().base(), FrameListPair(frame->Timestamp(), frame));
 }
 
 VCMFrameBuffer* FrameList::PopFrame(uint32_t timestamp) {
@@ -110,7 +110,7 @@
     }
     free_frames->push_back(oldest_frame);
     TRACE_EVENT_INSTANT1("webrtc", "JB::OldOrEmptyFrameDropped", "timestamp",
-                         oldest_frame->TimeStamp());
+                         oldest_frame->Timestamp());
     erase(begin());
   }
 }
@@ -212,7 +212,7 @@
       continue;
     }
     SsMap::iterator ss_it;
-    if (Find(frame_it.second->TimeStamp(), &ss_it)) {
+    if (Find(frame_it.second->Timestamp(), &ss_it)) {
       if (gof_idx >= ss_it->second.num_frames_in_gof) {
         continue;  // Assume corresponding SS not yet received.
       }
@@ -528,7 +528,7 @@
     }
   }
 
-  *timestamp = oldest_frame->TimeStamp();
+  *timestamp = oldest_frame->Timestamp();
   return true;
 }
 
@@ -564,7 +564,7 @@
       // Wait for this one to get complete.
       waiting_for_completion_.frame_size = frame->Length();
       waiting_for_completion_.latest_packet_time = frame->LatestPacketTimeMs();
-      waiting_for_completion_.timestamp = frame->TimeStamp();
+      waiting_for_completion_.timestamp = frame->Timestamp();
     }
   }
 
@@ -715,8 +715,8 @@
       frame->InsertPacket(packet, now_ms, decode_error_mode_, frame_data);
 
   if (previous_state != kStateComplete) {
-    TRACE_EVENT_ASYNC_BEGIN1("webrtc", "Video", frame->TimeStamp(), "timestamp",
-                             frame->TimeStamp());
+    TRACE_EVENT_ASYNC_BEGIN1("webrtc", "Video", frame->Timestamp(), "timestamp",
+                             frame->Timestamp());
   }
 
   if (buffer_state > 0) {
@@ -831,7 +831,7 @@
   for (FrameList::const_iterator it = decodable_frames_.begin();
        it != decodable_frames_.end(); ++it) {
     VCMFrameBuffer* decodable_frame = it->second;
-    if (IsNewerTimestamp(decodable_frame->TimeStamp(), frame.TimeStamp())) {
+    if (IsNewerTimestamp(decodable_frame->Timestamp(), frame.Timestamp())) {
       break;
     }
     decoding_state.SetState(decodable_frame);
@@ -865,7 +865,7 @@
        it != incomplete_frames_.end();) {
     VCMFrameBuffer* frame = it->second;
     if (IsNewerTimestamp(original_decoded_state.time_stamp(),
-                         frame->TimeStamp())) {
+                         frame->Timestamp())) {
       ++it;
       continue;
     }
@@ -947,11 +947,11 @@
   if (incomplete_frames_.empty()) {
     return 0;
   }
-  uint32_t start_timestamp = incomplete_frames_.Front()->TimeStamp();
+  uint32_t start_timestamp = incomplete_frames_.Front()->Timestamp();
   if (!decodable_frames_.empty()) {
-    start_timestamp = decodable_frames_.Back()->TimeStamp();
+    start_timestamp = decodable_frames_.Back()->Timestamp();
   }
-  return incomplete_frames_.Back()->TimeStamp() - start_timestamp;
+  return incomplete_frames_.Back()->Timestamp() - start_timestamp;
 }
 
 uint16_t VCMJitterBuffer::EstimatedLowSequenceNumber(
@@ -1184,10 +1184,10 @@
   incoming_frame_count_++;
 
   if (frame.FrameType() == kVideoFrameKey) {
-    TRACE_EVENT_ASYNC_STEP0("webrtc", "Video", frame.TimeStamp(),
+    TRACE_EVENT_ASYNC_STEP0("webrtc", "Video", frame.Timestamp(),
                             "KeyComplete");
   } else {
-    TRACE_EVENT_ASYNC_STEP0("webrtc", "Video", frame.TimeStamp(),
+    TRACE_EVENT_ASYNC_STEP0("webrtc", "Video", frame.Timestamp(),
                             "DeltaComplete");
   }
 
@@ -1263,7 +1263,7 @@
   }
   // No retransmitted frames should be a part of the jitter
   // estimate.
-  UpdateJitterEstimate(frame.LatestPacketTimeMs(), frame.TimeStamp(),
+  UpdateJitterEstimate(frame.LatestPacketTimeMs(), frame.Timestamp(),
                        frame.Length(), incomplete_frame);
 }