MSE: Replace crossfade splicing overlap trimming.

media/base/test_helpers.h

Index: media/base/test_helpers.h
diff --git a/media/base/test_helpers.h b/media/base/test_helpers.h
index c97e9a7dc5991a5127c4f1338a152dffd6db2e49..58944fed088e830fa336009fe1c0a4ecfe4050f9 100644
--- a/media/base/test_helpers.h
+++ b/media/base/test_helpers.h
@@ -242,6 +242,18 @@ MATCHER(WebMClusterBeforeFirstInfo, "") {
   return CONTAINS_STRING(arg, "Found Cluster element before Info.");
 }
 
+MATCHER_P3(TrimmedSpliceOverlap,
+           splice_time_us,
+           overlapped_start_us,
+           trim_duration_us,
+           "") {
+  return CONTAINS_STRING(
+      arg, "Audio buffer splice at PTS=" + base::IntToString(splice_time_us) +
+               "us. Trimmed tail of overlapped buffer (PTS=" +
+               base::IntToString(overlapped_start_us) + "us) by " +
+               base::IntToString(trim_duration_us));
+}
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_TEST_HELPERS_H_