Run telemetry_gpu_unittests via isolate on "Window Tests" & "Mac tests" and trybot.

testing/buildbot/chromium.win.json

Index: testing/buildbot/chromium.win.json
diff --git a/testing/buildbot/chromium.win.json b/testing/buildbot/chromium.win.json
index e75ed1b2add1e0a4197044b980b9c98147057895..68f26e5f7cd73c91ba8d8201878413353a69df9b 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -680,16 +680,18 @@
         "test": "wm_unittests"
       }
     ],
+    "isolated_scripts": [
+      {
+        "isolate_name": "telemetry_gpu_unittests",
+        "name": "telemetry_gpu_unittests"
+      }
+    ],
     "scripts": [
       {
         "name": "telemetry_unittests",
         "script": "telemetry_unittests.py"
       },
       {
-        "name": "telemetry_gpu_unittests",
-        "script": "telemetry_gpu_unittests.py"
-      },
-      {
         "name": "telemetry_perf_unittests",
         "script": "telemetry_perf_unittests.py"
       },
@@ -1113,16 +1115,18 @@
         "test": "wm_unittests"
       }
     ],
+    "isolated_scripts": [
+      {
+        "isolate_name": "telemetry_gpu_unittests",
+        "name": "telemetry_gpu_unittests"
+      }
+    ],
     "scripts": [
       {
         "name": "telemetry_unittests",
         "script": "telemetry_unittests.py"
       },
       {
-        "name": "telemetry_gpu_unittests",
-        "script": "telemetry_gpu_unittests.py"
-      },
-      {
         "name": "telemetry_perf_unittests",
         "script": "telemetry_perf_unittests.py"
       },
@@ -1451,16 +1455,18 @@
         "test": "wm_unittests"
       }
     ],
+    "isolated_scripts": [
+      {
+        "isolate_name": "telemetry_gpu_unittests",
+        "name": "telemetry_gpu_unittests"
+      }
+    ],
     "scripts": [
       {
         "name": "telemetry_unittests",
         "script": "telemetry_unittests.py"
       },
       {
-        "name": "telemetry_gpu_unittests",
-        "script": "telemetry_gpu_unittests.py"
-      },
-      {
         "name": "telemetry_perf_unittests",
         "script": "telemetry_perf_unittests.py"
       }
@@ -1977,16 +1983,18 @@
         "test": "wm_unittests"
       }
     ],
+    "isolated_scripts": [
+      {
+        "isolate_name": "telemetry_gpu_unittests",
+        "name": "telemetry_gpu_unittests"
+      }
+    ],
     "scripts": [
       {
         "name": "telemetry_unittests",
         "script": "telemetry_unittests.py"
       },
       {
-        "name": "telemetry_gpu_unittests",
-        "script": "telemetry_gpu_unittests.py"
-      },
-      {
         "name": "telemetry_perf_unittests",
         "script": "telemetry_perf_unittests.py"
       },