Disable smoothness.tough_filters_cases on Nexus 6.

tools/perf/benchmarks/smoothness.py

Index: tools/perf/benchmarks/smoothness.py
diff --git a/tools/perf/benchmarks/smoothness.py b/tools/perf/benchmarks/smoothness.py
index fb2d488c279fe8c1bea576214780aee025586de3..3a82f439c95dfa9b57cdaf4e35be83b38575bbb6 100644
--- a/tools/perf/benchmarks/smoothness.py
+++ b/tools/perf/benchmarks/smoothness.py
@@ -66,9 +66,15 @@ class SmoothnessToughFiltersCases(_Smoothness):
     return 'smoothness.tough_filters_cases'
 
   @classmethod
-  def ShouldDisable(cls, possible_browser):  # http://crbug.com/616520
-    return (cls.IsSvelte(possible_browser) and
-            possible_browser.browser_type == 'reference')
+  def ShouldDisable(cls, possible_browser):
+    # http://crbug.com/616520
+    if (cls.IsSvelte(possible_browser) and
+        possible_browser.browser_type == 'reference'):
+      return True
+    # http://crbug.com/624032
+    if possible_browser.platform.GetDeviceTypeName() == 'Nexus 6':
+      return True
+    return False
 
 
 class SmoothnessToughPathRenderingCases(_Smoothness):