Disable oortonline_tbmv2 on Nexus 9 due to repeated failures

tools/perf/benchmarks/oortonline.py

Index: tools/perf/benchmarks/oortonline.py
diff --git a/tools/perf/benchmarks/oortonline.py b/tools/perf/benchmarks/oortonline.py
index 810a1eb4db5a0533c9a87b9f48a8e00aa8717a6b..e7c43176ede6dc94a67eb3f79d2d843d89b4bcc5 100644
--- a/tools/perf/benchmarks/oortonline.py
+++ b/tools/perf/benchmarks/oortonline.py
@@ -95,6 +95,10 @@ class OortOnlineTBMv2(perf_benchmark.PerfBenchmark):
     return options
 
   @classmethod
+  def ShouldDisable(cls, possible_browser):
+    return possible_browser.platform.GetDeviceTypeName() == 'Nexus 9'
+
+  @classmethod
   def Name(cls):
     return 'oortonline_tbmv2'