[Benchmarking] Disable dawn_perf_tests on mac.

The upload for these is hanging on mac. My guess is that the root cause
is the same as for windows where it hits a 403. However, the result is
much worse for mac because it waits for over an hour before it hits the
overall timeout. The longterm solution is to convert dawn_perf_tests
to histograms.

Bug: 1035590
Change-Id: I9070d04e527cc4387ba793963de78fa73141a0a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1976020
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Auto-Submit: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726496}

testing/buildbot/chromium.perf.json

@@ -1986,44 +1986,6 @@
           "script": "//testing/trigger_scripts/perf_device_trigger.py"
         }
       },
-      {
-        "args": [
-          "--gtest-benchmark-name",
-          "dawn_perf_tests"
-        ],
-        "isolate_name": "dawn_perf_tests",
-        "merge": {
-          "script": "//tools/perf/process_perf_results.py"
-        },
-        "name": "dawn_perf_tests",
-        "override_compile_targets": [
-          "dawn_perf_tests"
-        ],
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "gpu": "1002:6821-4.0.20-3.2.8",
-              "os": "Mac-10.13.3",
-              "pool": "chrome.tests.perf",
-              "synthetic_product_name": "MacBookPro11,5_x86-64-i7-4870HQ_AMD Radeon R8 M370X 4.0.20 [3.2.8]_Intel Haswell Iris Pro Graphics 5200 4.0.20 [3.2.8]_16384_APPLE SSD SM0512G"
-            }
-          ],
-          "expiration": 7200,
-          "hard_timeout": 43200,
-          "ignore_task_failure": false,
-          "io_timeout": 21600,
-          "shards": 1
-        },
-        "trigger_script": {
-          "args": [
-            "--multiple-dimension-script-verbose",
-            "True"
-          ],
-          "requires_simultaneous_shard_dispatch": true,
-          "script": "//testing/trigger_scripts/perf_device_trigger.py"
-        }
-      },
       {
         "args": [
           "--gtest-benchmark-name",

tools/perf/core/perf_data_generator.py

@@ -773,11 +773,6 @@ BUILDERS = {
         'num_shards': 1,
         'type': TEST_TYPES.GTEST,
       },
-      {
-        'isolate': 'dawn_perf_tests',
-        'num_shards': 1,
-        'type': TEST_TYPES.GTEST,
-      },
     ],
     'platform': 'mac',
     'dimension': {