Tracing: Enable tracing_perftests on bots.

testing/buildbot/chromium.perf.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See //tools/perf/generate_perf_json.py to make changes": {},
   "Android Galaxy S5 Perf (3)": {
     "scripts": [
       {
         "args": [
           "cc_perftests"
         ],
         "name": "cc_perftests",
@@ skipping 83 matching lines @@
         "name": "cc_perftests",
         "script": "gtest_perf_test.py"
       },
       {
         "args": [
           "load_library_perf_tests",
           "--test-launcher-print-test-stdio=always"
         ],
         "name": "load_library_perf_tests",
         "script": "gtest_perf_test.py"
+      },
+      {
+        "args": [
+          "tracing_perftests",
+          "--test-launcher-print-test-stdio=always"
+        ],
+        "name": "tracing_perftests",
+        "script": "gtest_perf_test.py"
       }
     ]
   },
   "Win 7 ATI GPU Perf (2)": {
     "scripts": [
       {
         "args": [
           "angle_perftests",
           "--test-launcher-print-test-stdio=always",
           "--test-launcher-jobs=1"
@@ skipping 117 matching lines @@
           "--gtest_filter=TabCapturePerformanceTest.*:CastV2PerformanceTest.*",
           "--test-launcher-jobs=1",
           "--enable-gpu"
         ],
         "name": "performance_browser_tests",
         "script": "gtest_perf_test.py"
       }
     ]
   }
 }