Force scale factor to 1 on win-arm64-rel bots

Make browser_tests force scale factor to 1.0 on win-arm64-rel bots.

Bug: 1425573
Change-Id: I14d052d0c361782ce3ec881fbf17972abaa60697
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4348022
Commit-Queue: David Bienvenu <[email protected]>
Reviewed-by: Gregory Guterman <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1119393}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 9c6aeaf4c..69eae67 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -1227,6 +1227,13 @@
           'shards': 20,  # crbug.com/1361887
         },
       },
+      'win-arm64-rel': {
+        # Surface Pros aren't using 100% scaling, which some browser tests
+        # rely on.
+        'args': [
+          '---force-device-scale-factor=1',
+        ],
+      },
       'win-asan': {
          # Tests shows tests run faster with fewer retries by using fewer jobs crbug.com/1411912
         'args': [