[Benchmarking] Disable startup.mobile/maps_pwa:with_http_cache on weblayer.

TBR=alexclarke@chromium.org

Bug: 1030735
Change-Id: Ica41739148816215876d6da58bef0acaa548fada
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1951776Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721769}

tools/perf/expectations.config

@@ -7,7 +7,7 @@
 # tags: [ android-go android-low-end android-nexus-5 android-nexus-5x android-nexus-6
 #         android-pixel-2 desktop mobile ]
 # tags: [ android-not-webview android-webview android-webview-google android-chromium
-#         reference release debug exact release-x64 debug-x64 ]
+#         reference release debug exact release-x64 debug-x64 android-weblayer ]
 # results: [ Skip ]
 # conflicts_allowed: True
 
@@ -280,6 +280,7 @@ crbug.com/875878 [ android-nexus-6 android-webview ] rasterize_and_record_micro.
 # Benchmark: startup.mobile
 crbug.com/948789 [ android-nexus-5 ] startup.mobile/maps_pwa:with_http_cache [ Skip ]
 crbug.com/948789 [ android-nexus-5x ] startup.mobile/maps_pwa:with_http_cache [ Skip ]
+crbug.com/1030735 [ android-weblayer ] startup.mobile/maps_pwa:with_http_cache [ Skip ]
 
 # Benchmark: system_health.common_desktop
 crbug.com/984599 [ linux ] system_health.common_desktop/browse:social:tumblr_infinite_scroll:2018 [ Skip ]