Moves Cast test list from chromium.fyi to chromium.linux.

testing/buildbot/chromium.linux.json

 {
   "Android GN": {
     "additional_compile_targets": [
       "chrome_shell_apk",
       "mandoline:all"
     ]
   },
   "Android GN (dbg)": {
     "additional_compile_targets": [
       "chrome_shell_apk",
@@ skipping 17 matching lines @@
       {
         "name": "webview_licenses",
         "script": "webview_licenses.py"
       },
       {
         "name": "telemetry_perf_unittests",
         "script": "telemetry_perf_unittests.py"
       }
     ]
   },
+  "Cast Linux": {
+    "gtest_tests": [
+      {
+        "test": "base_unittests"
+      },
+      {
+        "test": "cacheinvalidation_unittests"
+      },
+      {
+        "test": "cast_base_unittests"
+      },
+      {
+        "test": "cast_media_unittests"
+      },
+      {
+        "test": "cast_shell_browser_test"
+      },
+      {
+        "test": "content_unittests"
+      },
+      {
+        "test": "crypto_unittests"
+      },
+      {
+        "test": "gpu_unittests"
+      },
+      {
+        "test": "ipc_tests"
+      },
+      {
+        "test": "jingle_unittests"
+      },
+      {
+        "test": "media_unittests"
+      },
+      {
+        "test": "midi_unittests"
+      },
+      {
+        "test": "net_unittests"
+      },
+      {
+        "test": "sandbox_linux_unittests"
+      },
+      {
+        "test": "sql_unittests"
+      },
+      {
+        "test": "sync_unit_tests"
+      },
+      {
+        "test": "ui_base_unittests"
+      },
+      {
+        "test": "url_unittests"
+      }
+    ]
+  },
   "Linux Clang (dbg)": {
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "accessibility_unittests"
       },
       {
         "test": "app_shell_unittests"
@@ skipping 1078 matching lines @@
       }
     ],
     "scripts": [
       {
         "name": "nacl_integration",
         "script": "nacl_integration.py"
       }
     ]
   }
 }