Disable v8.detached_context_age_in_gc on Android Nexus 9 Perf bot

tools/perf/benchmarks/v8.py

Index: tools/perf/benchmarks/v8.py
diff --git a/tools/perf/benchmarks/v8.py b/tools/perf/benchmarks/v8.py
index 00a3f06a0a5616cf705a36e0658446be8959e1f0..6cfdc1e300790ad7af573665ca2f8d16f4b020c0 100644
--- a/tools/perf/benchmarks/v8.py
+++ b/tools/perf/benchmarks/v8.py
@@ -76,6 +76,13 @@ class V8DetachedContextAgeInGC(perf_benchmark.PerfBenchmark):
   def Name(cls):
     return 'v8.detached_context_age_in_gc'
 
+  @classmethod
+  def ShouldDisable(cls, possible_browser):
+    # http://crbug.com/685350
+    if possible_browser.platform.GetDeviceTypeName() == 'Nexus 9':
+      return True
+    return False
+
 
 class _InfiniteScrollBenchmark(perf_benchmark.PerfBenchmark):
   """ Base class for infinite scroll benchmarks.