Increasing perf swarming job expiration to 4 hours.

testing/buildbot/chromium.perf.fyi.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See generate_perf_json.py to make changes": {},
   "Win 10 Low-End Perf Tests": {
     "isolated_scripts": [
       {
         "args": [
           "smoothness.top_25_smooth",
           "-v",
           "--upload-results",
@@ skipping 11 matching lines @@
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       },
       {
         "args": [
           "smoothness.top_25_smooth",
           "-v",
           "--upload-results",
           "--output-format=chartjson",
           "--browser=reference",
           "--output-trace-tag=_ref"
         ],
         "isolate_name": "telemetry_perf_tests",
         "name": "smoothness.top_25_smooth.reference",
         "override_compile_targets": [
           "telemetry_perf_tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       },
       {
         "args": [
           "sunspider",
           "-v",
           "--upload-results",
           "--output-format=chartjson",
           "--browser=release_x64"
         ],
         "isolate_name": "telemetry_perf_tests",
         "name": "sunspider",
         "override_compile_targets": [
           "telemetry_perf_tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       },
       {
         "args": [
           "sunspider",
           "-v",
           "--upload-results",
           "--output-format=chartjson",
           "--browser=reference",
           "--output-trace-tag=_ref"
         ],
         "isolate_name": "telemetry_perf_tests",
         "name": "sunspider.reference",
         "override_compile_targets": [
           "telemetry_perf_tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       },
       {
         "args": [
           "system_health.webview_startup",
           "-v",
           "--upload-results",
           "--output-format=chartjson",
           "--browser=release_x64"
         ],
         "isolate_name": "telemetry_perf_tests",
         "name": "system_health.webview_startup",
         "override_compile_targets": [
           "telemetry_perf_tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       },
       {
         "args": [
           "system_health.webview_startup",
           "-v",
           "--upload-results",
           "--output-format=chartjson",
           "--browser=reference",
           "--output-trace-tag=_ref"
         ],
         "isolate_name": "telemetry_perf_tests",
         "name": "system_health.webview_startup.reference",
         "override_compile_targets": [
           "telemetry_perf_tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       },
       {
         "args": [
           "page_cycler_v2.intl_hi_ru",
           "-v",
           "--upload-results",
           "--output-format=chartjson",
           "--browser=release_x64"
         ],
         "isolate_name": "telemetry_perf_tests",
         "name": "page_cycler_v2.intl_hi_ru",
         "override_compile_targets": [
           "telemetry_perf_tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       },
       {
         "args": [
           "page_cycler_v2.intl_hi_ru",
           "-v",
           "--upload-results",
           "--output-format=chartjson",
           "--browser=reference",
           "--output-trace-tag=_ref"
         ],
         "isolate_name": "telemetry_perf_tests",
         "name": "page_cycler_v2.intl_hi_ru.reference",
         "override_compile_targets": [
           "telemetry_perf_tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       },
       {
         "args": [
           "dromaeo.cssqueryjquery",
           "-v",
           "--upload-results",
           "--output-format=chartjson",
           "--browser=release_x64"
         ],
         "isolate_name": "telemetry_perf_tests",
         "name": "dromaeo.cssqueryjquery",
         "override_compile_targets": [
           "telemetry_perf_tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       },
       {
         "args": [
           "dromaeo.cssqueryjquery",
           "-v",
           "--upload-results",
           "--output-format=chartjson",
           "--browser=reference",
           "--output-trace-tag=_ref"
         ],
         "isolate_name": "telemetry_perf_tests",
         "name": "dromaeo.cssqueryjquery.reference",
         "override_compile_targets": [
           "telemetry_perf_tests"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "8086:22b1",
               "os": "Windows-10-10240",
               "pool": "Chrome-perf"
             },
             {
               "gpu": "1002:9830",
               "os": "Windows-10-10586",
               "pool": "Chrome-perf"
             }
-          ]
+          ],
+          "expiration": 14400
         }
       }
     ]
   }
 }