Disabling smoothness.tough_pinch_zoom_cases for android Nexus 5X

BUG=630701
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.perf:linux_perf_cq;master.tryserver.chromium.perf:mac_retina_perf_cq;master.tryserver.chromium.perf:winx64_10_perf_cq

Review-Url: https://codereview.chromium.org/2176773002
Cr-Commit-Position: refs/heads/master@{#407342}

tools/perf/benchmarks/smoothness.py

@@ -296,7 +296,11 @@ class SmoothnessToughPinchZoomCases(_Smoothness):
 
   @classmethod
   def ShouldDisable(cls, possible_browser):
-    return cls.IsSvelte(possible_browser)  # http://crbug.com/564008
+    return (
+       # http://crbug.com/564008
+       cls.IsSvelte(possible_browser) or
+       # http://crbug.com/630701
+       possible_browser.platform.GetDeviceTypeName() == 'Nexus 5X')
 
 
 @benchmark.Enabled('mac')