Increase angle_perftests shard timeout

BUG=791656
TBR=eyaich@chromium.org

Change-Id: I5cb3a2438db14009a308e3489d7719a53bf4134d
Reviewed-on: https://chromium-review.googlesource.com/806445Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521558}

testing/buildbot/chromium.perf.json

@@ -4721,7 +4721,9 @@
   "Android Nexus5X Perf": {
     "isolated_scripts": [
       {
-        "args": [],
+        "args": [
+          "--shard-timeout=180"
+        ],
         "isolate_name": "angle_perftests",
         "name": "angle_perftests",
         "swarming": {

tools/perf/core/perf_data_generator.py

@@ -176,9 +176,12 @@ def get_waterfall_config():
        'perf_tests': [
          ('tracing_perftests', 'build73-b1--device2'),
          ('gpu_perftests', 'build73-b1--device2'),
-         ('angle_perftests', 'build73-b1--device4'),
          #  ('cc_perftests', 'build73-b1--device2'),  # crbug.com/721757
-        ]
+       ],
+       'perf_tests_with_args': [
+         ('angle_perftests', 'build73-b1--device4', ['--shard-timeout=180'],
+           'angle_perftests'),
+       ]
       }
     ])
   waterfall = add_tester(