Disable start_with_url.cold.startup_pages on Nexus 7v2 and Nexus 9

tools/perf/benchmarks/start_with_url.py

Index: tools/perf/benchmarks/start_with_url.py
diff --git a/tools/perf/benchmarks/start_with_url.py b/tools/perf/benchmarks/start_with_url.py
index 45989ad8407546bf738a1b09504c9fe3e8df03b4..cb42df91295f8b0a20ad2f99430242184251814e 100644
--- a/tools/perf/benchmarks/start_with_url.py
+++ b/tools/perf/benchmarks/start_with_url.py
@@ -44,6 +44,11 @@ class StartWithUrlColdTBM(_StartupPerfBenchmark):
     super(StartWithUrlColdTBM, self).SetExtraBrowserOptions(options)
 
   @classmethod
+  def ShouldDisable(cls, possible_browser):  # http://crbug.com/667470
+    return (possible_browser.platform.GetDeviceTypeName() in
+            ['Nexus 7v2', 'Nexus 9'])
+
+  @classmethod
   def Name(cls):
     return 'start_with_url.cold.startup_pages'