Re-enable External Texture CTS for Mac/VideoFrame

Re-enable External Texture CTS for Mac/VideoFrame following test
expectations being revised.

Bug: dawn:1631
Bug: chromium:1316671
Change-Id: I7423c274b5d77832e3c98706829f66425f97e23b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/116370
Kokoro: Kokoro <noreply+kokoro@google.com>
Auto-Submit: Brandon1 Jones <brandon1.jones@intel.com>
Commit-Queue: Brandon1 Jones <brandon1.jones@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
diff --git a/webgpu-cts/expectations.txt b/webgpu-cts/expectations.txt
index db12f51..5ba518e 100644
--- a/webgpu-cts/expectations.txt
+++ b/webgpu-cts/expectations.txt
@@ -134,14 +134,14 @@
 # KEEP
 ################################################################################
 crbug.com/dawn/0000 [ linux ] webgpu:web_platform,external_texture,* [ Failure ]
-
-################################################################################
-# Skip external_texture,video:* tests due to incorrect expectation values.
-# See cts issue https://github.com/gpuweb/cts/issues/2042
-# KEEP
-################################################################################
-crbug.com/dawn/1082 [ mac ] webgpu:web_platform,external_texture,video:* [ Skip ]
-################################################################################
+crbug.com/dawn/1631 [ mac ] webgpu:web_platform,external_texture,video:importExternalTexture,compute:sourceType="VideoElement";videoName="red-green.bt2020.vp9.webm" [ Skip ]
+crbug.com/dawn/1631 [ mac ] webgpu:web_platform,external_texture,video:importExternalTexture,compute:sourceType="VideoElement";videoName="red-green.bt601.vp9.webm" [ Skip ]
+crbug.com/dawn/1631 [ mac ] webgpu:web_platform,external_texture,video:importExternalTexture,compute:sourceType="VideoElement";videoName="red-green.bt709.vp9.webm" [ Skip ]
+crbug.com/dawn/1631 [ mac ] webgpu:web_platform,external_texture,video:importExternalTexture,compute:sourceType="VideoElement";videoName="red-green.theora.ogv" [ Skip ]
+crbug.com/dawn/1631 [ mac ] webgpu:web_platform,external_texture,video:importExternalTexture,compute:sourceType="VideoElement";videoName="red-green.webmvp8.webm" [ Skip ]
+crbug.com/dawn/1631 [ mac ] webgpu:web_platform,external_texture,video:importExternalTexture,sample:sourceType="VideoElement";videoName="red-green.bt601.vp9.webm" [ Skip ]
+crbug.com/dawn/1631 [ mac ] webgpu:web_platform,external_texture,video:importExternalTexture,sample:sourceType="VideoElement";videoName="red-green.theora.ogv" [ Skip ]
+crbug.com/dawn/1631 [ mac ] webgpu:web_platform,external_texture,video:importExternalTexture,sample:sourceType="VideoElement";videoName="red-green.webmvp8.webm" [ Skip ]
 
 ################################################################################
 # texel_data failures