[Telemetry] Add benchmark that doesn't launch chrome and collects platform data.

testing/buildbot/chromium.perf.fyi.json

Index: testing/buildbot/chromium.perf.fyi.json
diff --git a/testing/buildbot/chromium.perf.fyi.json b/testing/buildbot/chromium.perf.fyi.json
index 2d8f47bf3844bc739900f400befb5e9115a0fd45..b8d65ca1cdf69131811ba5c7c8e5083263e89844 100644
--- a/testing/buildbot/chromium.perf.fyi.json
+++ b/testing/buildbot/chromium.perf.fyi.json
@@ -4784,6 +4784,65 @@
       },
       {
         "args": [
+          "power.idle_platform",
+          "-v",
+          "--upload-results",
+          "--output-format=chartjson",
+          "--browser=android-chromium"
+        ],
+        "isolate_name": "telemetry_perf_tests",
+        "name": "power.idle_platform",
+        "override_compile_targets": [
+          "telemetry_perf_tests"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "android_devices": "1",
+              "id": "build245-m4--device7",
+              "os": "Android",
+              "pool": "Chrome-perf"
+            }
+          ],
+          "expiration": 36000,
+          "hard_timeout": 7200,
+          "ignore_task_failure": false,
+          "io_timeout": 3600
+        }
+      },
+      {
+        "args": [
+          "power.idle_platform",
+          "-v",
+          "--upload-results",
+          "--output-format=chartjson",
+          "--browser=reference",
+          "--output-trace-tag=_ref"
+        ],
+        "isolate_name": "telemetry_perf_tests",
+        "name": "power.idle_platform.reference",
+        "override_compile_targets": [
+          "telemetry_perf_tests"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "android_devices": "1",
+              "id": "build245-m4--device7",
+              "os": "Android",
+              "pool": "Chrome-perf"
+            }
+          ],
+          "expiration": 36000,
+          "hard_timeout": 7200,
+          "ignore_task_failure": true,
+          "io_timeout": 3600
+        }
+      },
+      {
+        "args": [
           "power.steady_state",
           "-v",
           "--upload-results",
@@ -16452,6 +16511,65 @@
       },
       {
         "args": [
+          "power.idle_platform",
+          "-v",
+          "--upload-results",
+          "--output-format=chartjson",
+          "--browser=release_x64"
+        ],
+        "isolate_name": "telemetry_perf_tests",
+        "name": "power.idle_platform",
+        "override_compile_targets": [
+          "telemetry_perf_tests"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "gpu": "8086:22b1",
+              "id": "build141-b1",
+              "os": "Windows-10-10586",
+              "pool": "Chrome-perf"
+            }
+          ],
+          "expiration": 36000,
+          "hard_timeout": 7200,
+          "ignore_task_failure": false,
+          "io_timeout": 3600
+        }
+      },
+      {
+        "args": [
+          "power.idle_platform",
+          "-v",
+          "--upload-results",
+          "--output-format=chartjson",
+          "--browser=reference",
+          "--output-trace-tag=_ref"
+        ],
+        "isolate_name": "telemetry_perf_tests",
+        "name": "power.idle_platform.reference",
+        "override_compile_targets": [
+          "telemetry_perf_tests"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "gpu": "8086:22b1",
+              "id": "build141-b1",
+              "os": "Windows-10-10586",
+              "pool": "Chrome-perf"
+            }
+          ],
+          "expiration": 36000,
+          "hard_timeout": 7200,
+          "ignore_task_failure": true,
+          "io_timeout": 3600
+        }
+      },
+      {
+        "args": [
           "power.steady_state",
           "-v",
           "--upload-results",
@@ -28040,6 +28158,65 @@
       },
       {
         "args": [
+          "power.idle_platform",
+          "-v",
+          "--upload-results",
+          "--output-format=chartjson",
+          "--browser=release_x64"
+        ],
+        "isolate_name": "telemetry_perf_tests",
+        "name": "power.idle_platform",
+        "override_compile_targets": [
+          "telemetry_perf_tests"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "gpu": "1002:9874",
+              "id": "build205-b4",
+              "os": "Windows-10-10586",
+              "pool": "Chrome-perf"
+            }
+          ],
+          "expiration": 36000,
+          "hard_timeout": 7200,
+          "ignore_task_failure": false,
+          "io_timeout": 3600
+        }
+      },
+      {
+        "args": [
+          "power.idle_platform",
+          "-v",
+          "--upload-results",
+          "--output-format=chartjson",
+          "--browser=reference",
+          "--output-trace-tag=_ref"
+        ],
+        "isolate_name": "telemetry_perf_tests",
+        "name": "power.idle_platform.reference",
+        "override_compile_targets": [
+          "telemetry_perf_tests"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "gpu": "1002:9874",
+              "id": "build205-b4",
+              "os": "Windows-10-10586",
+              "pool": "Chrome-perf"
+            }
+          ],
+          "expiration": 36000,
+          "hard_timeout": 7200,
+          "ignore_task_failure": true,
+          "io_timeout": 3600
+        }
+      },
+      {
+        "args": [
           "power.steady_state",
           "-v",
           "--upload-results",