WebRtcVideoCapturerAdapter mods for Texture-backed VideoFrames

Interestingly, it is very similar to
https://codereview.chromium.org/277943002 !

BUG=440843, 362521

Review URL: https://codereview.chromium.org/1093223006

Cr-Commit-Position: refs/heads/master@{#326872}

content/renderer/media/webrtc/webrtc_video_capturer_adapter.cc

@@ -119,6 +119,15 @@ class WebRtcVideoCapturerAdapter::MediaVideoFrameFactory
     DCHECK(input_frame == &captured_frame_);
     DCHECK(frame_.get());
 
+    const int64_t timestamp_ns = frame_->timestamp().InMicroseconds() *
+                                 base::Time::kNanosecondsPerMicrosecond;
+
+    if (frame_->format() == media::VideoFrame::NATIVE_TEXTURE) {
+      return new cricket::WebRtcVideoFrame(
+          new rtc::RefCountedObject<VideoFrameWrapper>(frame_),
+          captured_frame_.elapsed_time, timestamp_ns);
+    }
+
     // Create a centered cropped visible rect that preservers aspect ratio for
     // cropped natural size.
     gfx::Rect visible_rect = frame_->visible_rect();
@@ -132,9 +141,6 @@ class WebRtcVideoCapturerAdapter::MediaVideoFrameFactory
             frame_, visible_rect, output_size,
             base::Bind(&ReleaseOriginalFrame, frame_));
 
-    const int64_t timestamp_ns = frame_->timestamp().InMicroseconds() *
-                                 base::Time::kNanosecondsPerMicrosecond;
-
     // If no scaling is needed, return a wrapped version of |frame_| directly.
     if (video_frame->natural_size() == video_frame->visible_rect().size()) {
       return new cricket::WebRtcVideoFrame(
@@ -257,10 +263,8 @@ void WebRtcVideoCapturerAdapter::OnFrameCaptured(
   DCHECK(thread_checker_.CalledOnValidThread());
   TRACE_EVENT0("video", "WebRtcVideoCapturerAdapter::OnFrameCaptured");
   if (!(media::VideoFrame::I420 == frame->format() ||
-        media::VideoFrame::YV12 == frame->format())) {
-    // Some types of sources support textures as output. Since connecting
-    // sources and sinks do not check the format, we need to just ignore
-    // formats that we can not handle.
+        media::VideoFrame::YV12 == frame->format() ||
+        media::VideoFrame::NATIVE_TEXTURE == frame->format())) {
     NOTREACHED();
     return;
   }