Add VisibilityType.TRANSIENTLY_HIDDEN to match chromecast::VisibilityType.

See: //chromium/src/chromecast/browser/cast_content_window.h

Bug: b/147646410

Test: none
Change-Id: Iaee645a6b88330a4416cc87112aafb4a7bf2fe9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015571Reviewed-by: Simeon Anfinrud <sanfin@chromium.org>
Commit-Queue: Zhiheng(Vincent) Li <vincentli@google.com>
Auto-Submit: Zhiheng(Vincent) Li <vincentli@google.com>
Cr-Commit-Position: refs/heads/master@{#734720}

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWebContentsIntentUtils.java

@@ -151,6 +151,8 @@ public class CastWebContentsIntentUtils {
     static final int VISIBITY_TYPE_PARTIAL_OUT = VisibilityType.PARTIAL_OUT;
     @VisibilityType
     static final int VISIBITY_TYPE_HIDDEN = VisibilityType.HIDDEN;
+    @VisibilityType
+    static final int VISIBITY_TYPE_TRANSIENTLY_HIDDEN = VisibilityType.TRANSIENTLY_HIDDEN;
 
     // CastWebContentsSurfaceHelper -> CastWebContentsComponent.Receiver
     // -> CastContentWindowAndroid