Add filter function to gpu_times.

tools/perf/benchmarks/gpu_times.py

Index: tools/perf/benchmarks/gpu_times.py
diff --git a/tools/perf/benchmarks/gpu_times.py b/tools/perf/benchmarks/gpu_times.py
index 13915bbd969858627eb36919bfbc59409b19242f..c2ccd0ec7f90f024a6dccdd7e1ff377db381c702 100644
--- a/tools/perf/benchmarks/gpu_times.py
+++ b/tools/perf/benchmarks/gpu_times.py
@@ -26,6 +26,10 @@ class _GPUTimes(benchmark.Benchmark):
         overhead_level=cat_filter,
         get_metrics_from_flags_callback=_GetGPUTimelineMetric)
 
+  @classmethod
+  def ValueCanBeAddedPredicate(cls, value):
+    return (isinstance(value, gpu_timeline.GPUTimelineListOfValues) or
+            isinstance(value, gpu_timeline.GPUTimelineValue))
 
 @benchmark.Disabled  # http://crbug.com/455292
 class GPUTimesKeyMobileSites(_GPUTimes):
@@ -68,3 +72,4 @@ class GPUTimesGpuRasterizationTop25Sites(_GPUTimes):
   @classmethod
   def Name(cls):
     return 'gpu_times.gpu_rasterization.top_25_smooth'
+