Add stopwatches for a few possible pain points in MediaGallery.

app/src/main/java/org/thoughtcrime/securesms/mediasend/MediaRepository.java

@@ -24,6 +24,7 @@ import org.signal.core.util.logging.Log;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.mms.PartAuthority;
 import org.thoughtcrime.securesms.util.MediaUtil;
+import org.thoughtcrime.securesms.util.Stopwatch;
 import org.thoughtcrime.securesms.util.StorageUtil;
 import org.thoughtcrime.securesms.util.Util;
 import org.whispersystems.libsignal.util.guava.Optional;
@@ -201,14 +202,20 @@ public class MediaRepository {
 
   @WorkerThread
   private @NonNull List<Media> getMediaInBucket(@NonNull Context context, @NonNull String bucketId) {
+    Stopwatch stopwatch = new Stopwatch("getMediaInBucket");
+
     List<Media> images = getMediaInBucket(context, bucketId, Images.Media.EXTERNAL_CONTENT_URI, true);
     List<Media> videos = getMediaInBucket(context, bucketId, Video.Media.EXTERNAL_CONTENT_URI, false);
     List<Media> media  = new ArrayList<>(images.size() + videos.size());
 
+    stopwatch.split("post fetch");
+
     media.addAll(images);
     media.addAll(videos);
     Collections.sort(media, (o1, o2) -> Long.compare(o2.getDate(), o1.getDate()));
+    stopwatch.split("post sort");
 
+    stopwatch.stop(TAG);
     return media;
   }
 

app/src/main/java/org/thoughtcrime/securesms/mediasend/v2/gallery/MediaGalleryFragment.kt

@@ -18,6 +18,7 @@ import org.thoughtcrime.securesms.mediasend.Media
 import org.thoughtcrime.securesms.mediasend.MediaRepository
 import org.thoughtcrime.securesms.mediasend.v2.MediaCountIndicatorButton
 import org.thoughtcrime.securesms.util.MappingAdapter
+import org.thoughtcrime.securesms.util.Stopwatch
 import org.thoughtcrime.securesms.util.ViewUtil
 import org.thoughtcrime.securesms.util.livedata.LiveDataUtil
 import org.thoughtcrime.securesms.util.visible
@@ -115,7 +116,11 @@ class MediaGalleryFragment : Fragment(R.layout.v2_media_gallery_fragment) {
     viewStateLiveData.observe(viewLifecycleOwner) { state ->
       bottomBarGroup.visible = state.selectedMedia.isNotEmpty()
       countButton.setCount(state.selectedMedia.size)
+
+      val stopwatch = Stopwatch("mediaSubmit")
       selectedAdapter.submitList(state.selectedMedia.map { MediaGallerySelectedItem.Model(it) }) {
+        stopwatch.split("after-submit")
+        stopwatch.stop("MediaGalleryFragment")
         if (state.selectedMedia.isNotEmpty()) {
           selectedRecycler.smoothScrollToPosition(state.selectedMedia.size - 1)
         }