Reland of Delete cricket::VideoFrame::GetTimeStamp. (patchset #1 id:1 of https://codereview.webrtc.org/2315703002/ )

Reason for revert:
Chrome has now been updated (cl https://codereview.chromium.org/2317673002/).

Original issue's description:
> Revert of Delete cricket::VideoFrame::GetTimeStamp. (patchset #2 id:150001 of https://codereview.webrtc.org/2310043002/ )
>
> Reason for revert:
> Broke Chrome fyi bots. See, e.g.,
>
> https://build.chromium.org/p/chromium.webrtc.fyi/builders/Win%20Builder/builds/6730/steps/compile/logs/stdio
>
> Use of GetTimeStamp must be eliminated in Chrome before relanding.
>
> Original issue's description:
> > Reland of Delete cricket::VideoFrame::GetTimeStamp. (patchset #1 id:1 of https://codereview.webrtc.org/2306953002/ )
> >
> > Reason for revert:
> > Will reland after downstream projects are updated.
> >
> > Original issue's description:
> > > Revert of Delete cricket::VideoFrame::GetTimeStamp. (patchset #1 id:1 of https://codereview.webrtc.org/2305623002/ )
> > >
> > > Reason for revert:
> > > Broke downstream project.
> > >
> > > Original issue's description:
> > > > Delete cricket::VideoFrame::GetTimeStamp.
> > > >
> > > > TBR=tkchin@webrtc.org  # Trivial change to VideoRendererAdapter
> > > > BUG=webrtc:5682
> > > >
> > > > Committed: https://crrev.com/fd6c99e43137d01fa6c120f7160f7c2999d1d8a3
> > > > Cr-Commit-Position: refs/heads/master@{#14037}
> > >
> > > TBR=perkj@webrtc.org
> > > # Skipping CQ checks because original CL landed less than 1 days ago.
> > > NOPRESUBMIT=true
> > > NOTREECHECKS=true
> > > NOTRY=true
> > > BUG=webrtc:5682
> > >
> > > Committed: https://crrev.com/bca69e87de5df290f728833a4b3d8af3ae5d88e6
> > > Cr-Commit-Position: refs/heads/master@{#14038}
> >
> > TBR=perkj@webrtc.org
> > # Not skipping CQ checks because original CL landed more than 1 days ago.
> > BUG=webrtc:5682
> >
> > Committed: https://crrev.com/fa1ba19c5c7c57c8d16fae1a5da51877770fd53e
> > Cr-Commit-Position: refs/heads/master@{#14089}
>
> TBR=perkj@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:5682
>
> Committed: https://crrev.com/92b2e0852fcbe7765926755ccee884db965b6231
> Cr-Commit-Position: refs/heads/master@{#14090}

TBR=perkj@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5682

Review-Url: https://codereview.webrtc.org/2316493003
Cr-Commit-Position: refs/heads/master@{#14093}
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm b/webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm
index 73682d3..55d3917 100644
--- a/webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm
+++ b/webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm
@@ -30,7 +30,8 @@
     RTCVideoFrame* videoFrame = [[RTCVideoFrame alloc]
         initWithVideoBuffer:nativeVideoFrame.video_frame_buffer()
                    rotation:nativeVideoFrame.rotation()
-                timeStampNs:nativeVideoFrame.GetTimeStamp()];
+                timeStampNs:nativeVideoFrame.timestamp_us() *
+                                rtc::kNumNanosecsPerMicrosec];
     CGSize current_size = (videoFrame.rotation % 180 == 0)
                               ? CGSizeMake(videoFrame.width, videoFrame.height)
                               : CGSizeMake(videoFrame.height, videoFrame.width);