Reland "Mark flaky copyToTexture tests on Mac/Intel"

This is a reland of commit 4974818aaa2c84c5c110a85c615dfe747abb591b

Original change's description:
> Mark flaky copyToTexture tests on Mac/Intel
>
> No-Try: true
> Bug: chromium:1450814
> Change-Id: I93c9e74ba389116320956de7e09e0eb51dcea495
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/135820
> Commit-Queue: Kai Ninomiya <kainino@chromium.org>
> Kokoro: Kai Ninomiya <kainino@chromium.org>
> Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>

Bug: chromium:1450814
Change-Id: I3a0577a60a392255d35fd230471979c0942c39f2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/136184
Kokoro: Kokoro <noreply+kokoro@google.com>
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Austin Eng <enga@chromium.org>
Auto-Submit: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Kokoro: Austin Eng <enga@chromium.org>
diff --git a/webgpu-cts/expectations.txt b/webgpu-cts/expectations.txt
index c8a0c59..8a70049 100644
--- a/webgpu-cts/expectations.txt
+++ b/webgpu-cts/expectations.txt
@@ -76,6 +76,12 @@
 crbug.com/1236130 [ linux ] webgpu:web_platform,canvas,readbackFromWebGPUCanvas:* [ Skip ]
 
 ################################################################################
+# copyToTexture flakes on Mac
+################################################################################
+crbug.com/1450814 [ mac intel webgpu-adapter-default ] webgpu:web_platform,canvas,readbackFromWebGPUCanvas:* [ RetryOnFailure ]
+crbug.com/1450814 [ mac intel webgpu-adapter-default ] webgpu:web_platform,copyToTexture,* [ RetryOnFailure ]
+
+################################################################################
 # web_platform crashes on SwiftShader
 # Skipped instead of just Crash because of the number of failures
 # KEEP