Disable long-running gmail stories on svelte

tools/perf/page_sets/system_health/long_running_stories.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from page_sets.login_helpers import google_login
 from page_sets.system_health import platforms
 from page_sets.system_health import system_health_story
 
 from telemetry import benchmark
 
@@ skipping 40 matching lines @@
     # navigate to a sub-URL to set up the session and hit the resulting
     # redirection loop. Afterwards, we can safely navigate to
     # https://mail.google.com.
     action_runner.Navigate(
         'https://mail.google.com/mail/mu/mp/872/trigger_redirection_loop')
     action_runner.tab.WaitForDocumentReadyStateToBeComplete()
 
 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(
         'document.querySelector("#isppromo a") !== null')
     action_runner.ExecuteJavaScript(
         'document.querySelector("#isppromo a").click()')
     # Wait until the UI loads.
     action_runner.WaitForJavaScriptCondition(
         'document.getElementById("apploadingdiv").style.height === "0px"')
 
@@ skipping 17 matching lines @@
 
 @benchmark.Disabled('android-webview')  # Webview does not have tabs.
 class LongRunningGmailMobileBackgroundStory(_LongRunningGmailMobileBase):
   BACKGROUND = True
   NAME = 'long_running:tools:gmail-background'
 
 
 class LongRunningGmailDesktopBackgroundStory(_LongRunningGmailDesktopBase):
   BACKGROUND = True
   NAME = 'long_running:tools:gmail-background'