Add support for more scalability modes (1.5:1 resolution ratio).

Added modes:
- S2T1h
- S2T2h
- S2T3h
- S3T1h
- S3T2h
- S3T3h

Bug: webrtc:13960
Change-Id: I618a30c68b0ce1609847ee33a2298fe8fa0720c9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/273664
Reviewed-by: Florent Castelli <orphis@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Åsa Persson <asapersson@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37968}
diff --git a/api/video_codecs/scalability_mode.cc b/api/video_codecs/scalability_mode.cc
index ab26915..c449b42 100644
--- a/api/video_codecs/scalability_mode.cc
+++ b/api/video_codecs/scalability_mode.cc
@@ -62,16 +62,28 @@
       return "L3T3_KEY";
     case ScalabilityMode::kS2T1:
       return "S2T1";
+    case ScalabilityMode::kS2T1h:
+      return "S2T1h";
     case ScalabilityMode::kS2T2:
       return "S2T2";
+    case ScalabilityMode::kS2T2h:
+      return "S2T2h";
     case ScalabilityMode::kS2T3:
       return "S2T3";
+    case ScalabilityMode::kS2T3h:
+      return "S2T3h";
     case ScalabilityMode::kS3T1:
       return "S3T1";
+    case ScalabilityMode::kS3T1h:
+      return "S3T1h";
     case ScalabilityMode::kS3T2:
       return "S3T2";
+    case ScalabilityMode::kS3T2h:
+      return "S3T2h";
     case ScalabilityMode::kS3T3:
       return "S3T3";
+    case ScalabilityMode::kS3T3h:
+      return "S3T3h";
   }
   RTC_CHECK_NOTREACHED();
 }