Disable failing perf tests on android-pixel2-perf

Dsiabling the following failing perf tests on android-pixel2-perf:
system_health.memory_mobile/browse:chrome:newtab
system_health.common_mobile/browse:chrome:newtab
v8.browsing_mobile/browse:chrome:newtab
v8.browsing_mobile-future/browse:chrome:newtab
system_health.memory_mobile/browse:chrome:omnibox
system_health.common_mobile/browse:chrome:omnibox
v8.browsing_mobile/browse:chrome:omnibox
v8.browsing_mobile-future/browse:chrome:omnibox

TBR=crouleau@chromium.org
NOTRY=true

Bug: 1002640, 1002665
Change-Id: Ie0d5edfb7f47b2e3d7d6266c6b727cf12b02bbc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795892Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695320}

tools/perf/expectations.config

@@ -315,6 +315,8 @@ crbug.com/954949 [ android-nexus-5x android-webview ] system_health.common_mobil
 crbug.com/961417 [ android-go ] system_health.common_mobile/browse:social:tumblr_infinite_scroll:2018 [ Skip ]
 crbug.com/979786 [ android-nexus-5x android-webview ] system_health.common_mobile/browse:news:cricbuzz [ Skip ]
 crbug.com/1002546 [ android ] system_health.common_mobile/background:news:nytimes [ Skip ]
+crbug.com/1002640 [ android-pixel-2 ] system_health.common_mobile/browse:chrome:newtab [ Skip ]
+crbug.com/1002665 [ android-pixel-2 ] system_health.common_mobile/browse:chrome:omnibox [ Skip ]
 
 # Benchmark: system_health.memory_desktop
 crbug.com/984599 [ linux ] system_health.memory_desktop/long_running:tools:gmail-foreground [ Skip ]
@@ -373,6 +375,8 @@ crbug.com/923527 [ android-webview ] system_health.memory_mobile/load:media:soun
 crbug.com/947267 [ android-nexus-5x ] system_health.memory_mobile/background:media:imgur [ Skip ]
 crbug.com/954949 [ android-nexus-5x android-webview ] system_health.memory_mobile/browse:news:washingtonpost [ Skip ]
 crbug.com/961417 [ android-go ] system_health.memory_mobile/browse:social:tumblr_infinite_scroll:2018 [ Skip ]
+crbug.com/1002640 [ android-pixel-2 ] system_health.memory_mobile/browse:chrome:newtab [ Skip ]
+crbug.com/1002665 [ android-pixel-2 ] system_health.memory_mobile/browse:chrome:omnibox [ Skip ]
 
 crbug.com/964960 [ android-nexus-5x ] system_health.memory_mobile/* [ Skip ]
 
@@ -421,6 +425,8 @@ crbug.com/929839 [ android-go ] v8.browsing_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/954949 [ android-nexus-5x android-webview ] v8.browsing_mobile/browse:news:washingtonpost [ Skip ]
 crbug.com/961417 [ android-go ] v8.browsing_mobile/browse:social:tumblr_infinite_scroll:2018 [ Skip ]
 crbug.com/979786 [ android-nexus-5x android-webview ] v8.browsing_mobile/browse:media:flickr_infinite_scroll [ Skip ]
+crbug.com/1002640 [ android-pixel-2 ] v8.browsing_mobile/browse:chrome:newtab [ Skip ]
+crbug.com/1002665 [ android-pixel-2 ] v8.browsing_mobile/browse:chrome:omnibox [ Skip ]
 
 # Benchmark: v8.browsing_mobile-future
 crbug.com/714650 [ android ] v8.browsing_mobile-future/browse:news:globo [ Skip ]
@@ -434,6 +440,8 @@ crbug.com/865400 [ android-pixel-2 ] v8.browsing_mobile-future/browse:shopping:a
 crbug.com/923116 [ android ] v8.browsing_mobile-future/browse:shopping:avito [ Skip ]
 crbug.com/954949 [ android-nexus-5x android-webview ] v8.browsing_mobile-future/browse:news:washingtonpost [ Skip ]
 crbug.com/958336 [ android ] v8.browsing_mobile-future/browse:shopping:flipkart [ Skip ]
+crbug.com/1002640 [ android-pixel-2 ] v8.browsing_mobile-future/browse:chrome:newtab [ Skip ]
+crbug.com/1002665 [ android-pixel-2 ] v8.browsing_mobile-future/browse:chrome:omnibox [ Skip ]
 
 # Benchmark: v8.runtime_stats.top_25
 crbug.com/954229 [ mac ] v8.runtime_stats.top_25/* [ Skip ]