Disable long-running gmail stories on svelte

tools/perf/page_sets/system_health/long_running_stories.py

Index: tools/perf/page_sets/system_health/long_running_stories.py
diff --git a/tools/perf/page_sets/system_health/long_running_stories.py b/tools/perf/page_sets/system_health/long_running_stories.py
index 2a70985470e68b495adb9a21a09f520106b3361c..417faaef7ad0807d510fd41423fdbf2a923958c7 100644
--- a/tools/perf/page_sets/system_health/long_running_stories.py
+++ b/tools/perf/page_sets/system_health/long_running_stories.py
@@ -58,6 +58,11 @@ class _LongRunningGmailBase(_LongRunningStory):
 class _LongRunningGmailMobileBase(_LongRunningGmailBase):
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
+  @classmethod
+  def ShouldDisable(cls, possible_browser):
+    # crbug.com/651198
+    return possible_browser.platform.IsSvelte()
+
   def _DidLoadDocument(self, action_runner):
     # Close the "Get Inbox by Gmail" interstitial.
     action_runner.WaitForJavaScriptCondition(