[vtvda] Make max supported resolution 4096 x 4096.

This ensures that portrait 4k videos get hardware accelerated decoding.

R=sandersd

Bug: 1103432
Change-Id: I6ac1c75eac7d21c6cd2c57edac368b84c56ffa85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2361183
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799201}

media/gpu/mac/vt_video_decode_accelerator_mac.cc

@@ -1639,7 +1639,7 @@ VTVideoDecodeAccelerator::GetSupportedProfiles() {
     SupportedProfile profile;
     profile.profile = supported_profile;
     profile.min_resolution.SetSize(16, 16);
-    profile.max_resolution.SetSize(4096, 2160);
+    profile.max_resolution.SetSize(4096, 4096);
     profiles.push_back(profile);
   }
   return profiles;